Quarterly report pursuant to Section 13 or 15(d)

Debt (Details)

v3.7.0.1
Debt (Details)
$ in Thousands
6 Months Ended
Mar. 21, 2016
USD ($)
item
Oct. 30, 2014
USD ($)
item
Jun. 30, 2017
USD ($)
shares
Dec. 31, 2016
USD ($)
Debt disclosures        
Long-term Debt, Gross     $ 600,000 $ 600,000
Debt outstanding       198,512
Margin Loan Agreements | Charter        
Debt disclosures        
Number of common shares pledged as collateral | shares     9,500,000  
Value of pledged collateral     $ 3,200,000  
BroadbandSPV | Margin Loan Agreements        
Debt disclosures        
Long-term Debt, Gross     $ 400,000  
Interest rate basis     three-month LIBOR  
Debt Instrument, Interest Rate, Effective Percentage     2.85%  
BroadbandSPV | Margin Loan Agreements | Three-month LIBOR        
Debt disclosures        
Basis spread on variable rate     1.55%  
BroadbandSPV | Margin Loan Agreements | Term loan        
Debt disclosures        
Unused commitment fee percentage     0.25%  
BroadbandSPV | Margin Loan Agreements | Draw loan        
Debt disclosures        
Unused commitment fee percentage     0.50%  
BroadbandSPV | Margin Loan Agreements        
Debt disclosures        
Number of debt agreements | item   2    
Maximum borrowing capacity   $ 400,000    
BroadbandSPV | 2014 Margin Loan Agreement        
Debt disclosures        
Long-term Debt, Gross     $ 400,000 400,000
Cheetah 5 | Margin Loan Agreements        
Debt disclosures        
Long-term Debt, Gross     $ 200,000  
Number of debt agreements | item 2      
Maximum borrowing capacity $ 300,000      
Interest rate basis     LIBOR  
Debt Instrument, Interest Rate, Effective Percentage     3.40%  
Cheetah 5 | Margin Loan Agreements | LIBOR        
Debt disclosures        
Basis spread on variable rate     2.10%  
Cheetah 5 | Margin Loan Agreements | Term loan        
Debt disclosures        
Maximum borrowing capacity $ 200,000      
Cheetah 5 | Margin Loan Agreements | Draw loan        
Debt disclosures        
Maximum borrowing capacity     $ 100,000  
Remaining borrowing capacity     100,000  
Cheetah 5 | 2016 Margin Loan Agreement        
Debt disclosures        
Long-term Debt, Gross     $ 200,000 $ 200,000