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Debt (Schedule of Obligations Under Debt Arrangements) (Details) - USD ($)
Dec. 31, 2016
Dec. 31, 2015
Jul. 31, 2015
Jul. 23, 2015
May 21, 2015
May 15, 2014
Feb. 08, 2013
Debt Instrument [Line Items]              
Senior secured credit facilities $ 1,278,200,000 $ 1,115,000,000          
Senior unsecured notes, principal     $ 750,000,000        
Unamortized discount an debt issuance costs 36,831,000 42,946,000          
Senior unsecured notes 1,813,169,000 1,807,054,000          
Long-term debt, principal 3,128,200,000 2,965,000,000          
Total long-term debt, net value 3,091,369,000 2,922,054,000          
6.00% Senior Unsecured Notes [Member]              
Debt Instrument [Line Items]              
Senior unsecured notes, principal 400,000,000 400,000,000     $ 400,000,000    
Unamortized discount an debt issuance costs 6,758,000 7,825,000          
Senior unsecured notes 393,242,000 392,175,000          
5.750% Senior Unsecured Notes [Member]              
Debt Instrument [Line Items]              
Senior unsecured notes, principal 350,000,000 350,000,000         $ 350,000,000
Unamortized discount an debt issuance costs 4,163,000 5,183,000          
Senior unsecured notes 345,837,000 344,817,000          
5.625% Senior Unsecured Notes [Member]              
Debt Instrument [Line Items]              
Senior unsecured notes, principal 350,000,000 350,000,000       $ 350,000,000  
Unamortized discount an debt issuance costs 6,614,000 7,510,000          
Senior unsecured notes 343,386,000 342,490,000          
6.750% Senior Unsecured Notes [Member]              
Debt Instrument [Line Items]              
Senior unsecured notes, principal 750,000,000 750,000,000   $ 750,000,000      
Unamortized discount an debt issuance costs 19,296,000 22,428,000          
Senior unsecured notes 730,704,000 727,572,000          
Credit Facility [Domain]              
Debt Instrument [Line Items]              
Unamortized discount an debt issuance costs $ 0 $ 0