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Debt (Schedule of Obligations Under Debt Arrangements) (Details) - USD ($)
Mar. 31, 2019
Dec. 31, 2018
Dec. 11, 2017
Debt Instrument [Line Items]      
Senior secured credit facility $ 942,000,000 $ 970,100,000  
Unamortized debt issuance expense and discounts (premiums) 35,753,000 37,637,000  
Senior unsecured notes, net of debt issuance costs 2,464,247,000 2,462,363,000  
Total long-term debt, principal 3,442,000,000 3,470,100,000  
Total long-term debt $ 3,406,247,000 $ 3,432,463,000  
6.750% senior unsecured notes      
Debt Instrument [Line Items]      
Senior unsecured notes, stated rate 6.75% 6.75%  
Principal $ 750,000,000 $ 750,000,000  
Unamortized debt issuance expense and discounts (premiums) 11,919,000 12,763,000  
Senior unsecured notes, net of debt issuance costs $ 738,081,000 $ 737,237,000  
6.000% senior unsecured notes      
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) 4,357,000 4,624,000  
Senior unsecured notes, net of debt issuance costs $ 395,643,000 $ 395,376,000  
5.625% senior unsecured notes      
Debt Instrument [Line Items]      
Senior unsecured notes, stated rate 5.625% 5.625%  
Principal $ 350,000,000 $ 350,000,000  
Unamortized debt issuance expense and discounts (premiums) 4,596,000 4,820,000  
Senior unsecured notes, net of debt issuance costs $ 345,404,000 $ 345,180,000  
6.500% senior unsecured notes      
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) 7,936,000 8,241,000  
Senior unsecured notes, net of debt issuance costs $ 542,064,000 $ 541,759,000  
6.250% senior unsecured notes      
Debt Instrument [Line Items]      
Senior unsecured notes, stated rate 6.25% 6.25% 6.25%
Principal $ 450,000,000 $ 450,000,000 $ 450,000,000
Unamortized debt issuance expense and discounts (premiums) 6,945,000 7,189,000  
Senior unsecured notes, net of debt issuance costs 443,055,000 442,811,000  
Senior Secured Credit Facility      
Debt Instrument [Line Items]      
Unamortized debt issuance expense and discounts (premiums) 10,000,000 10,800,000  
Line of Credit      
Debt Instrument [Line Items]      
Unamortized debt issuance expense and discounts (premiums) $ 0 $ 0