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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 |  |  |  |  |

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