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Debt (Schedule of Obligations Under Debt Arrangements) (Details) - USD ($) | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 11, 2017 | May 21, 2015 | May 15, 2014 | Feb. 08, 2013
--- | --- | --- | --- | --- | --- | ---
Debt Instrument [Line Items] |  |  |  |  |  |
Senior secured credit facility | $ 970,100,000 | $ 1,099,200,000 |  |  |  |
Unamortized discount an debt issuance costs | 37,637,000 | 46,252,000 |  |  |  |
Senior unsecured notes, net of debt issuance costs | 2,462,363,000 | 2,598,918,000 |  |  |  |
Long-term debt, principal | 3,470,100,000 | 3,744,370,000 |  |  |  |
Total long-term debt, net value | 3,432,463,000 | 3,698,118,000 |  |  |  |
5.750% senior unsecured notes |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Senior unsecured notes, principal | 0 | 145,170,000 |  |  |  | $ 350,000,000
Unamortized discount an debt issuance costs | 0 | 1,303,000 |  |  |  |
Senior unsecured notes, net of debt issuance costs | 0 | 143,867,000 |  |  |  |
6.750% senior unsecured notes |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Senior unsecured notes, principal | 750,000,000 | 750,000,000 |  |  |  |
Unamortized discount an debt issuance costs | 12,763,000 | 16,077,000 |  |  |  |
Senior unsecured notes, net of debt issuance costs | 737,237,000 | 733,923,000 |  |  |  |
6.000% senior unsecured notes |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Senior unsecured notes, principal | 400,000,000 | 400,000,000 |  | $ 400,000,000 |  |
Unamortized discount an debt issuance costs | 4,624,000 | 5,691,000 |  |  |  |
Senior unsecured notes, net of debt issuance costs | 395,376,000 | 394,309,000 |  |  |  |
5.625% senior unsecured notes |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Senior unsecured notes, principal | 350,000,000 | 350,000,000 |  |  | $ 350,000,000 |
Unamortized discount an debt issuance costs | 4,820,000 | 5,717,000 |  |  |  |
Senior unsecured notes, net of debt issuance costs | 345,180,000 | 344,283,000 |  |  |  |
6.500% senior unsecured notes |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Senior unsecured notes, principal | 550,000,000 | 550,000,000 |  |  |  |
Unamortized discount an debt issuance costs | 8,241,000 | 9,462,000 |  |  |  |
Senior unsecured notes, net of debt issuance costs | 541,759,000 | 540,538,000 |  |  |  |
6.250% senior unsecured notes |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Senior unsecured notes, principal | 450,000,000 | 450,000,000 | $ 450,000,000 |  |  |
Unamortized discount an debt issuance costs | 7,189,000 | 8,002,000 |  |  |  |
Senior unsecured notes, net of debt issuance costs | 442,811,000 | 441,998,000 |  |  |  |
Senior secured credit facility |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Unamortized discount an debt issuance costs | 10,800,000 | 14,100,000 |  |  |  |
Line of Credit |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Unamortized discount an debt issuance costs | $ 0 | $ 0 |  |  |  |

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