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Long-Term Debt Senior Notes (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Aug. 20, 2018
Jul. 16, 2018
Jun. 15, 2018
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Debt Instrument [Line Items]                
Principal Amount, Net of Unamortized Deferred Financing Costs       $ 2,447,290   $ 2,447,290   $ 2,769,663
Loss on extinguishment of debt       (26,722) $ 0 (26,722) $ (35)  
Cash paid for extinguishment of debt [1]             13  
Non-cash loss on extinguishment of debt           6,334 $ 22  
Senior Notes                
Debt Instrument [Line Items]                
Principal Amount       2,476,796   2,476,796   2,801,392
Unamortized Deferred Financing Costs       (29,506)   (29,506)   (31,729)
Principal Amount, Net of Unamortized Deferred Financing Costs       $ 2,447,290   $ 2,447,290   2,769,663
6.50% Senior Notes due 2021                
Debt Instrument [Line Items]                
Senior Notes, interest rate, stated percentage       6.50%   6.50%    
6.125% Senior Notes due 2022                
Debt Instrument [Line Items]                
Senior Notes, interest rate, stated percentage       6.125%   6.125%    
6.50% Senior Notes due 2023                
Debt Instrument [Line Items]                
Senior Notes, interest rate, stated percentage       6.50%   6.50%    
5.0% Senior Notes due 2024                
Debt Instrument [Line Items]                
Senior Notes, interest rate, stated percentage       5.00%   5.00%    
5.625% Senior Notes due 2025                
Debt Instrument [Line Items]                
Senior Notes, interest rate, stated percentage       5.625%   5.625%    
6.75% Senior Notes due 2026                
Debt Instrument [Line Items]                
Senior Notes, interest rate, stated percentage       6.75%   6.75%    
Senior Notes | 6.50% Senior Notes due 2021                
Debt Instrument [Line Items]                
Senior Notes, interest rate, stated percentage       6.50%   6.50%    
Principal Amount       $ 0   $ 0   344,611
Unamortized Deferred Financing Costs       0   0   (2,656)
Principal Amount, Net of Unamortized Deferred Financing Costs       0   $ 0   341,955
Debt Instrument, Repurchased Face Amount     $ 344,611          
Debt Instrument, Redemption Price, Percentage     102.167%          
Debt Instrument, Repurchased Settlement Amount   $ 355,900            
Loss on extinguishment of debt       9,800        
Cash paid for extinguishment of debt       7,500        
Non-cash loss on extinguishment of debt       $ 2,300        
Senior Notes | 6.125% Senior Notes due 2022                
Debt Instrument [Line Items]                
Senior Notes, interest rate, stated percentage       6.125%   6.125%    
Principal Amount       $ 476,796   $ 476,796   561,796
Unamortized Deferred Financing Costs       (4,171)   (4,171)   (5,800)
Principal Amount, Net of Unamortized Deferred Financing Costs       472,625   472,625   555,996
Debt Instrument, Repurchased Face Amount       $ 85,000   $ 85,000    
Senior Notes | 6.50% Senior Notes due 2023                
Debt Instrument [Line Items]                
Senior Notes, interest rate, stated percentage       6.50%   6.50%    
Principal Amount       $ 0   $ 0   394,985
Unamortized Deferred Financing Costs       0   0   (3,707)
Principal Amount, Net of Unamortized Deferred Financing Costs       0   0   391,278
Debt Instrument, Repurchased Face Amount       $ 394,985   $ 394,985    
Senior Notes | 5.0% Senior Notes due 2024                
Debt Instrument [Line Items]                
Senior Notes, interest rate, stated percentage       5.00%   5.00%    
Principal Amount       $ 500,000   $ 500,000   500,000
Unamortized Deferred Financing Costs       (4,919)   (4,919)   (5,610)
Principal Amount, Net of Unamortized Deferred Financing Costs       $ 495,081   $ 495,081   494,390
Senior Notes | 5.625% Senior Notes due 2025                
Debt Instrument [Line Items]                
Senior Notes, interest rate, stated percentage       5.625%   5.625%    
Principal Amount       $ 500,000   $ 500,000   500,000
Unamortized Deferred Financing Costs       (6,035)   (6,035)   (6,714)
Principal Amount, Net of Unamortized Deferred Financing Costs       $ 493,965   $ 493,965   493,286
Senior Notes | 6.75% Senior Notes due 2026                
Debt Instrument [Line Items]                
Senior Notes, interest rate, stated percentage       6.75%   6.75%    
Principal Amount       $ 500,000   $ 500,000   500,000
Unamortized Deferred Financing Costs       (6,615)   (6,615)   (7,242)
Principal Amount, Net of Unamortized Deferred Financing Costs       $ 493,385   $ 493,385   492,758
Senior Notes | 6.625% Senior Notes due 2027                
Debt Instrument [Line Items]                
Senior Notes, interest rate, stated percentage       6.625%   6.625%    
Principal Amount $ 500,000     $ 500,000   $ 500,000   0
Unamortized Deferred Financing Costs       (7,766)   (7,766)   0
Principal Amount, Net of Unamortized Deferred Financing Costs       492,234   $ 492,234   $ 0
Proceeds from Debt, Net of Issuance Costs 492,100              
Debt Issuance Costs, Gross $ 7,900              
Senior Notes | 6.125% Senior Notes Due 2022 and 6.50% Senior Notes Due 2023 [Member]                
Debt Instrument [Line Items]                
Debt Instrument, Repurchased Settlement Amount       497,800        
Loss on extinguishment of debt       16,900        
Cash paid for extinguishment of debt       12,900        
Non-cash loss on extinguishment of debt       $ 4,000        
[1] (1) Included as a component within the cash paid to repurchase Senior Notes, including premium line item on the accompanying statements of cash flows.