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Debt (Schedule of Obligations Under Debt Arrangements) (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Dec. 11, 2017
Feb. 08, 2013
Debt Instrument [Line Items]        
Senior secured credit facility, principal $ 1,279,000 $ 1,099,200    
Unamortized Debt Issuance Expense and Discounts (Premiums) 43,251 46,252    
Senior unsecured notes 2,456,749 2,598,918    
Total long-term debt, principal 3,779,000 3,744,370    
Total long-term debt 3,735,749 3,698,118    
Senior Secured Credit Facility        
Debt Instrument [Line Items]        
Unamortized Debt Issuance Expense and Discounts (Premiums) $ 13,100 $ 14,100    
5.750% senior unsecured notes due February 2021        
Debt Instrument [Line Items]        
Senior unsecured notes, stated rate 5.75% 5.75%   5.75%
Principal $ 0 $ 145,170    
Unamortized Debt Issuance Expense and Discounts (Premiums) 0 1,303    
Senior unsecured notes $ 0 $ 143,867    
6.750% senior unsecured notes due August 2022        
Debt Instrument [Line Items]        
Senior unsecured notes, stated rate 6.75% 6.75%    
Principal $ 750,000 $ 750,000    
Unamortized Debt Issuance Expense and Discounts (Premiums) 15,257 16,077    
Senior unsecured notes $ 734,743 $ 733,923    
6.000% senior unsecured notes due May 2023        
Debt Instrument [Line Items]        
Senior unsecured notes, stated rate 6.00% 6.00%    
Principal $ 400,000 $ 400,000    
Unamortized Debt Issuance Expense and Discounts (Premiums) 5,424 5,691    
Senior unsecured notes $ 394,576 $ 394,309    
5.625% senior unsecured notes due June 2024        
Debt Instrument [Line Items]        
Senior unsecured notes, stated rate 5.625% 5.625%    
Principal $ 350,000 $ 350,000    
Unamortized Debt Issuance Expense and Discounts (Premiums) 5,493 5,717    
Senior unsecured notes $ 344,507 $ 344,283    
6.500% senior unsecured notes due October 2025        
Debt Instrument [Line Items]        
Senior unsecured notes, stated rate 6.50% 6.50%    
Principal $ 550,000 $ 550,000    
Unamortized Debt Issuance Expense and Discounts (Premiums) 9,157 9,462    
Senior unsecured notes $ 540,843 $ 540,538    
6.250% senior unsecured notes due May 2026        
Debt Instrument [Line Items]        
Senior unsecured notes, stated rate 6.25% 6.25% 6.25%  
Principal $ 450,000 $ 450,000 $ 450,000  
Unamortized Debt Issuance Expense and Discounts (Premiums) 7,920 8,002    
Senior unsecured notes 442,080 441,998    
Line of Credit        
Debt Instrument [Line Items]        
Unamortized Debt Issuance Expense and Discounts (Premiums) $ 0 $ 0