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Debt (Schedule of Obligations Under Debt Arrangements) (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 11, 2017
Dec. 31, 2016
Jul. 23, 2015
May 21, 2015
May 15, 2014
Feb. 08, 2013
Feb. 01, 2012
Debt Instrument [Line Items]                
Senior secured credit facilities $ 1,099,200   $ 1,278,200          
Unamortized discount an debt issuance costs 46,252   36,831          
Senior unsecured notes 2,598,918   1,813,169          
Long-term debt, principal 3,744,370   3,128,200          
Total long-term debt, net value 3,698,118   3,091,369          
5.750% senior unsecured notes                
Debt Instrument [Line Items]                
Senior unsecured notes, principal 145,170   350,000       $ 350,000  
Unamortized discount an debt issuance costs 1,303   4,163          
Senior unsecured notes 143,867   345,837          
6.750% senior unsecured notes                
Debt Instrument [Line Items]                
Senior unsecured notes, principal 750,000   750,000 $ 750,000        
Unamortized discount an debt issuance costs 16,077   19,296          
Senior unsecured notes 733,923   730,704          
6.000% senior unsecured notes                
Debt Instrument [Line Items]                
Senior unsecured notes, principal 400,000   400,000   $ 400,000     $ 350,000
Unamortized discount an debt issuance costs 5,691   6,758          
Senior unsecured notes 394,309   393,242          
5.625% senior unsecured notes                
Debt Instrument [Line Items]                
Senior unsecured notes, principal 350,000   350,000     $ 350,000    
Unamortized discount an debt issuance costs 5,717   6,614          
Senior unsecured notes 344,283   343,386          
6.500% senior unsecured notes                
Debt Instrument [Line Items]                
Senior unsecured notes, principal 550,000   0          
Unamortized discount an debt issuance costs 9,462   0          
Senior unsecured notes 540,538   0          
6.250% senior unsecured notes                
Debt Instrument [Line Items]                
Senior unsecured notes, principal 450,000 $ 450,000 0          
Unamortized discount an debt issuance costs 8,002   0          
Senior unsecured notes 441,998   0          
Credit Facility [Domain]                
Debt Instrument [Line Items]                
Unamortized discount an debt issuance costs $ 0   $ 0