Annual report pursuant to Section 13 and 15(d)

Debt (Details)

v3.10.0.1
Debt (Details)
$ in Thousands, shares in Millions
1 Months Ended 8 Months Ended 12 Months Ended
Aug. 24, 2018
USD ($)
Oct. 30, 2014
item
Aug. 31, 2017
USD ($)
Aug. 31, 2017
Dec. 31, 2018
USD ($)
shares
Dec. 31, 2017
USD ($)
Apr. 04, 2018
USD ($)
Debt disclosures              
Long-term Debt         $ 522,928 $ 497,370  
Repayment of margin loan         $ 133,000 600,000  
Amended 2017 Margin Loan Agreement              
Debt disclosures              
Debt Instrument, Interest Rate, Effective Percentage         3.89%    
Amended 2017 Margin Loan Agreement | Charter              
Debt disclosures              
Number of common shares pledged as collateral | shares         6.8    
Value of pledged collateral         $ 1,900,000    
2014 Margin Loan Agreement | Three-month LIBOR              
Debt disclosures              
Unused commitment fee percentage       0.25%      
Basis spread on variable rate       1.55%      
SPV | Amended 2017 Margin Loan Agreement              
Debt disclosures              
Long-term Debt, Face Amount             $ 25,000
Long-term Debt, Gross         525,000 $ 500,000  
Maximum borrowing capacity $ 1,000,000            
Additional allowed borrowing capacity $ 1,000,000            
Remaining borrowing capacity         $ 475,000    
Basis spread on variable rate 0.50%            
SPV | Amended 2017 Margin Loan Agreement | LIBOR              
Debt disclosures              
Interest rate basis LIBOR            
Basis spread on variable rate 1.00%            
SPV | Amended 2017 Margin Loan Agreement | Three-month LIBOR              
Debt disclosures              
Interest rate basis three-month LIBOR            
Basis spread on variable rate 1.50%            
SPV | Amended 2017 Margin Loan Agreement | Federal Funds Rate              
Debt disclosures              
Basis spread on variable rate 0.50%            
BroadbandSPV | Margin Loan Agreements              
Debt disclosures              
Interest rate basis       three-month LIBOR      
BroadbandSPV | 2014 Margin Loan Agreement              
Debt disclosures              
Number of debt agreements | item   2          
Repayment of margin loan     $ 400,000        
Cheetah 5 | 2016 Margin Loan Agreement              
Debt disclosures              
Repayment of margin loan     $ 200,000        
Cheetah 5 | 2016 Margin Loan Agreement | Charter              
Debt disclosures              
Interest rate basis       LIBOR      
Cheetah 5 | 2016 Margin Loan Agreement | LIBOR              
Debt disclosures              
Unused commitment fee percentage       0.50%      
Basis spread on variable rate       2.10%