Leases (Tables)
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12 Months Ended | 
Dec. 31, 2020  | 
| Leases | 
 
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| Lease Expense and Supplemental Cash Flow Information | 
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Year ended December 31,  | 
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2020  | 
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Operating lease cost (1)  | 
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$  | 
 2,840  | 
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Finance lease cost  | 
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   | 
    | 
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Depreciation of leased assets  | 
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$  | 
 1,472  | 
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Interest on lease liabilities  | 
  | 
   | 
 25  | 
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Total finance lease cost  | 
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$  | 
 1,497  | 
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(1) | 
Included within operating lease costs were short-term lease costs and variable lease costs, which were not material to the financial statements. | 
  
Total operating lease cost for the year ended December 31, 2019 was $0.7 million.  For the year ended December 31, 2018, the Company recorded total rental expense of $1.0 million. 
 
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Year ended   | 
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December 31, 2020  | 
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Weighted-average remaining lease term (years):  | 
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    | 
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Finance leases  | 
   | 
 3.1  | 
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Operating leases  | 
   | 
 4.8  | 
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Weighted-average discount rate:  | 
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    | 
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Finance leases  | 
   | 
 3.9  | 
%  | 
 
Operating leases  | 
   | 
 4.2  | 
%  | 
 
 
 
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Year ended December 31,  | 
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2020  | 
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amounts in thousands  | 
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Cash paid for amounts included in the measurement of lease liabilities:  | 
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    | 
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Operating cash flows from operating leases  | 
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$  | 
 2,572  | 
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Operating cash flows from finance leases  | 
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$  | 
 18  | 
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Financing cash flows from finance leases  | 
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$  | 
 362  | 
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ROU assets obtained in exchange for lease obligations  | 
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   | 
    | 
  | 
 
Operating leases  | 
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$  | 
 —  | 
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Finance leases  | 
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$  | 
 —  | 
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| Supplemental Balance Sheet Information | 
  
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  | 
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December 31,  | 
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      | 
2020  | 
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amounts in thousands  | 
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Operating leases:  | 
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    | 
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Operating lease ROU assets, net (1)  | 
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$  | 
 98,992  | 
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  | 
  | 
  | 
  | 
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Current operating lease liabilities (2)  | 
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$  | 
 34,402  | 
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Operating lease liabilities (3)  | 
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   | 
 61,305  | 
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Total operating lease liabilities  | 
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$  | 
 95,707  | 
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  | 
  | 
  | 
  | 
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Finance Leases:  | 
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   | 
    | 
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Property and equipment, at cost  | 
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$  | 
 9,926  | 
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Accumulated depreciation  | 
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   | 
 (1,472)  | 
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Property and equipment, net  | 
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$  | 
 8,454  | 
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  | 
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  | 
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Current obligations under finance leases (4)  | 
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$  | 
 3,745  | 
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Obligations under finance leases  | 
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   | 
 3,744  | 
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Total finance lease liabilities  | 
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$  | 
 7,489  | 
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(1) | 
Operating lease ROU assets, net are included within the Other assets, net line item in the accompanying consolidated balance sheets. | 
  
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(2) | 
Current operating lease liabilities are included within the Other current liabilities line item in the accompanying consolidated balance sheets. | 
  
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(3) | 
Operating lease liabilities are included within the Other liabilities line item in the accompanying consolidated balance sheets. | 
  
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(4) | 
Current obligations under finance leases are included within the Other current liabilities line item in the accompanying consolidated balance sheets. | 
  
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| Future Lease Payments on Finance Leases | 
  
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Finance Leases  | 
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Operating Leases  | 
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Tower Obligations  | 
 
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amounts in thousands  | 
 
2021  | 
  | 
$  | 
 3,625  | 
   | 
 34,710  | 
   | 
 7,401  | 
 
2022  | 
  | 
   | 
 1,973  | 
   | 
 26,786  | 
   | 
 7,549  | 
 
2023  | 
  | 
   | 
 678  | 
   | 
 17,500  | 
   | 
 7,700  | 
 
2024  | 
  | 
   | 
 688  | 
   | 
 8,090  | 
   | 
 7,854  | 
 
2025  | 
  | 
   | 
 697  | 
   | 
 4,005  | 
   | 
 8,011  | 
 
Thereafter  | 
  | 
   | 
 349  | 
   | 
 17,410  | 
   | 
 117,062  | 
 
Total payments  | 
  | 
   | 
 8,010  | 
   | 
 108,501  | 
   | 
 155,577  | 
 
Less: imputed interest  | 
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   | 
 521  | 
   | 
 12,794  | 
   | 
 64,724  | 
 
Total liabilities  | 
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$  | 
 7,489  | 
   | 
 95,707  | 
   | 
 90,853  | 
 
 
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| Schedule of aggregate minimum annual lease payments | 
  
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      | 
Finance Leases  | 
      | 
Operating Leases  | 
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Tower Obligations  | 
 
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  | 
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amounts in thousands  | 
 
2021  | 
  | 
$  | 
 3,625  | 
   | 
 34,710  | 
   | 
 7,401  | 
 
2022  | 
  | 
   | 
 1,973  | 
   | 
 26,786  | 
   | 
 7,549  | 
 
2023  | 
  | 
   | 
 678  | 
   | 
 17,500  | 
   | 
 7,700  | 
 
2024  | 
  | 
   | 
 688  | 
   | 
 8,090  | 
   | 
 7,854  | 
 
2025  | 
  | 
   | 
 697  | 
   | 
 4,005  | 
   | 
 8,011  | 
 
Thereafter  | 
  | 
   | 
 349  | 
   | 
 17,410  | 
   | 
 117,062  | 
 
Total payments  | 
  | 
   | 
 8,010  | 
   | 
 108,501  | 
   | 
 155,577  | 
 
Less: imputed interest  | 
  | 
   | 
 521  | 
   | 
 12,794  | 
   | 
 64,724  | 
 
Total liabilities  | 
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$  | 
 7,489  | 
   | 
 95,707  | 
   | 
 90,853  | 
 
 
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| Future Lease Payments on Tower Obligation | 
  
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      | 
Finance Leases  | 
      | 
Operating Leases  | 
      | 
Tower Obligations  | 
 
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  | 
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amounts in thousands  | 
 
2021  | 
  | 
$  | 
 3,625  | 
   | 
 34,710  | 
   | 
 7,401  | 
 
2022  | 
  | 
   | 
 1,973  | 
   | 
 26,786  | 
   | 
 7,549  | 
 
2023  | 
  | 
   | 
 678  | 
   | 
 17,500  | 
   | 
 7,700  | 
 
2024  | 
  | 
   | 
 688  | 
   | 
 8,090  | 
   | 
 7,854  | 
 
2025  | 
  | 
   | 
 697  | 
   | 
 4,005  | 
   | 
 8,011  | 
 
Thereafter  | 
  | 
   | 
 349  | 
   | 
 17,410  | 
   | 
 117,062  | 
 
Total payments  | 
  | 
   | 
 8,010  | 
   | 
 108,501  | 
   | 
 155,577  | 
 
Less: imputed interest  | 
  | 
   | 
 521  | 
   | 
 12,794  | 
   | 
 64,724  | 
 
Total liabilities  | 
  | 
$  | 
 7,489  | 
   | 
 95,707  | 
   | 
 90,853  | 
 
 
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