Quarterly report pursuant to Section 13 or 15(d)

Intangible Assets and Goodwill (Goodwill) (Details)

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Intangible Assets and Goodwill (Goodwill) (Details)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
USD ($)
Goodwill [Roll Forward]  
Balance at January 1, 2018 $ 25,569
Acquisitions 924,629
Balance at March 31, 2018 950,198
GCI Holdings  
Goodwill [Roll Forward]  
Balance at January 1, 2018 0
Acquisitions 924,629
Balance at March 31, 2018 924,629
Corporate and other  
Goodwill [Roll Forward]  
Balance at January 1, 2018 25,569
Acquisitions 0
Balance at March 31, 2018 $ 25,569