Quarterly report pursuant to Section 13 or 15(d)

Debt (Details)

v3.5.0.2
Debt (Details)
 1 Months Ended 4 Months Ended 6 Months Ended
Mar. 21, 2016
USD ($)
item
Apr. 07, 2015
USD ($)
Oct. 31, 2014
USD ($)
Oct. 30, 2014
USD ($)
item
Jul. 31, 2015
USD ($)
Nov. 30, 2014
USD ($)
Jul. 31, 2015
Jun. 30, 2016
USD ($)
shares
Dec. 31, 2015
USD ($)
Mar. 27, 2015
USD ($)
Debt disclosures                    
Debt outstanding               $ 598,032,000 $ 399,703,000  
Distribution to parent     $ 300,000,000              
Margin Loan Agreements | Charter                    
Debt disclosures                    
Number of common shares pledged as collateral | shares               9,500,000    
Value of pledged collateral               $ 2,200,000,000    
Revolving Credit Facility                    
Debt disclosures                    
Maximum borrowing capacity                   $ 234,000,000
Interest rate basis             three-month LIBOR      
Basis spread on variable rate             0.64%      
Proceeds from Issuance of Debt   $ 40,000,000                
Debt Instrument, Unused Borrowing Capacity Fee, Percent         0.12%   0.12%      
Repayments of debt         $ 40,000,000          
BroadbandSPV | Margin Loan Agreements                    
Debt disclosures                    
Long-term Debt, Gross               400,000,000    
Remaining borrowing capacity               $ 0    
Interest rate basis               three-month LIBOR    
Basis spread on variable rate               1.55%    
Debt Instrument, Interest Rate, Effective Percentage               2.18%    
BroadbandSPV | Margin Loan Agreements                    
Debt disclosures                    
Number of debt agreements | item       2            
Maximum borrowing capacity       $ 400,000,000            
Proceeds From Issuance Of Secured Debt     $ 320,000,000     $ 52,000,000        
Cheetah 5                    
Debt disclosures                    
Maximum borrowing capacity               $ 100,000,000    
Cheetah 5 | Margin Loan Agreements                    
Debt disclosures                    
Number of debt agreements | item 2                  
Maximum borrowing capacity $ 300,000,000                  
Long-term Debt, Gross               200,000,000    
Remaining borrowing capacity               $ 100,000,000    
Interest rate basis               LIBOR    
Basis spread on variable rate               2.10%    
Debt Instrument, Interest Rate, Effective Percentage               2.73%    
Cheetah 5 | Margin Loan Agreements | Term loan                    
Debt disclosures                    
Maximum borrowing capacity $ 200,000,000