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Debt (Schedule of Obligations Under Debt Arrangements) (Details) - USD ($)
Mar. 31, 2020
Jan. 16, 2020
Dec. 31, 2019
Jul. 23, 2015
Debt Instrument [Line Items]        
Senior secured credit facility $ 977,400,000   $ 959,300,000  
Unamortized debt issuance expense and discounts (premiums) 32,629,000   30,063,000  
Senior unsecured notes, net of debt issuance costs 2,463,171,000   2,469,937,000  
Total long-term debt, principal 3,473,200,000   3,459,300,000  
Total long-term debt $ 3,440,571,000   $ 3,429,237,000  
6.750% senior unsecured notes due 2022        
Debt Instrument [Line Items]        
Senior unsecured notes, stated rate 6.75%   6.75% 6.75%
Principal $ 0   $ 750,000,000  
Unamortized debt issuance expense and discounts (premiums) 0   9,349,000  
Senior unsecured notes, net of debt issuance costs $ 0   $ 740,651,000  
6.000% senior unsecured notes due 2023        
Debt Instrument [Line Items]        
Senior unsecured notes, stated rate 6.00%   6.00%  
Principal $ 400,000,000   $ 400,000,000  
Unamortized debt issuance expense and discounts (premiums) 3,290,000   3,557,000  
Senior unsecured notes, net of debt issuance costs $ 396,710,000   $ 396,443,000  
5.625% senior unsecured notes due 2024        
Debt Instrument [Line Items]        
Senior unsecured notes, stated rate 5.625%   5.625%  
Principal $ 349,200,000   $ 350,000,000  
Unamortized debt issuance expense and discounts (premiums) 3,699,000   3,923,000  
Senior unsecured notes, net of debt issuance costs $ 345,501,000   $ 346,077,000  
6.500% senior unsecured notes due 2025        
Debt Instrument [Line Items]        
Senior unsecured notes, stated rate 6.50%   6.50%  
Principal $ 550,000,000   $ 550,000,000  
Unamortized debt issuance expense and discounts (premiums) 6,715,000   7,020,000  
Senior unsecured notes, net of debt issuance costs $ 543,285,000   $ 542,980,000  
6.250% senior unsecured notes due 2026        
Debt Instrument [Line Items]        
Senior unsecured notes, stated rate 6.25%   6.25%  
Principal $ 446,600,000   $ 450,000,000  
Unamortized debt issuance expense and discounts (premiums) 5,970,000   6,214,000  
Senior unsecured notes, net of debt issuance costs $ 440,630,000   $ 443,786,000  
7.75% senior unsecured notes        
Debt Instrument [Line Items]        
Senior unsecured notes, stated rate 7.75% 7.75% 7.75%  
Principal $ 750,000,000 $ 750,000,000.0 $ 0  
Unamortized debt issuance expense and discounts (premiums) 12,955,000   0  
Senior unsecured notes, net of debt issuance costs 737,045,000   0  
Senior Secured Credit Facility        
Debt Instrument [Line Items]        
Unamortized debt issuance expense and discounts (premiums) 6,800,000   7,600,000  
Line of Credit        
Debt Instrument [Line Items]        
Unamortized debt issuance expense and discounts (premiums) $ 0   $ 0