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Debt (Schedule of Obligations Under Debt Arrangements) (Details) - USD ($) | Mar. 31, 2019 | Dec. 31, 2018 | Dec. 11, 2017
--- | --- | --- | ---
Debt Instrument [Line Items] |  |  |
Senior secured credit facility | $ 942,000,000 | $ 970,100,000 |
Unamortized debt issuance expense and discounts (premiums) | 35,753,000 | 37,637,000 |
Senior unsecured notes, net of debt issuance costs | 2,464,247,000 | 2,462,363,000 |
Total long-term debt, principal | 3,442,000,000 | 3,470,100,000 |
Total long-term debt | $ 3,406,247,000 | $ 3,432,463,000 |
6.750% senior unsecured notes |  |  |
Debt Instrument [Line Items] |  |  |
Senior unsecured notes, stated rate | 6.75% | 6.75% |
Principal | $ 750,000,000 | $ 750,000,000 |
Unamortized debt issuance expense and discounts (premiums) | 11,919,000 | 12,763,000 |
Senior unsecured notes, net of debt issuance costs | $ 738,081,000 | $ 737,237,000 |
6.000% senior unsecured notes |  |  |
Debt Instrument [Line Items] |  |  |
Senior unsecured notes, stated rate | 6.00% | 6.00% |
Principal | $ 400,000,000 | $ 400,000,000 |
Unamortized debt issuance expense and discounts (premiums) | 4,357,000 | 4,624,000 |
Senior unsecured notes, net of debt issuance costs | $ 395,643,000 | $ 395,376,000 |
5.625% senior unsecured notes |  |  |
Debt Instrument [Line Items] |  |  |
Senior unsecured notes, stated rate | 5.625% | 5.625% |
Principal | $ 350,000,000 | $ 350,000,000 |
Unamortized debt issuance expense and discounts (premiums) | 4,596,000 | 4,820,000 |
Senior unsecured notes, net of debt issuance costs | $ 345,404,000 | $ 345,180,000 |
6.500% senior unsecured notes |  |  |
Debt Instrument [Line Items] |  |  |
Senior unsecured notes, stated rate | 6.50% | 6.50% |
Principal | $ 550,000,000 | $ 550,000,000 |
Unamortized debt issuance expense and discounts (premiums) | 7,936,000 | 8,241,000 |
Senior unsecured notes, net of debt issuance costs | $ 542,064,000 | $ 541,759,000 |
6.250% senior unsecured notes |  |  |
Debt Instrument [Line Items] |  |  |
Senior unsecured notes, stated rate | 6.25% | 6.25% | 6.25%
Principal | $ 450,000,000 | $ 450,000,000 | $ 450,000,000
Unamortized debt issuance expense and discounts (premiums) | 6,945,000 | 7,189,000 |
Senior unsecured notes, net of debt issuance costs | 443,055,000 | 442,811,000 |
Senior Secured Credit Facility |  |  |
Debt Instrument [Line Items] |  |  |
Unamortized debt issuance expense and discounts (premiums) | 10,000,000 | 10,800,000 |
Line of Credit |  |  |
Debt Instrument [Line Items] |  |  |
Unamortized debt issuance expense and discounts (premiums) | $ 0 | $ 0 |

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