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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 |  |  |  |  |

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