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Fair Value Measurements - Schedule of Fair Value of Liabilities (Details) - USD ($) $ in Thousands | Sep. 30, 2019 | Mar. 15, 2019 | Dec. 31, 2018 | Nov. 30, 2017
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Senior Notes Due 2026 | Senior Notes |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Fair value of debt instrument | $ 382,480 |  | $ 372,000 |
Interest rate, stated percentage | 5.375% |  |  | 5.375%
Senior Notes Due 2027 | Senior Notes |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Fair value of debt instrument | $ 498,750 |  |  |
Interest rate, stated percentage | 6.875% | 6.875% |  |
Carrying Value | Senior Notes Due 2026 | Senior Notes |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Fair value of debt instrument | $ 392,369 |  | 391,630 |
Carrying Value | Senior Notes Due 2027 | Senior Notes |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Fair value of debt instrument | 489,498 |  |  |
Revolving Credit Facility | Line of Credit |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Fair value of debt instrument | 120,000 |  | 300,000 |
Revolving Credit Facility | Carrying Value | Line of Credit |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Fair value of debt instrument | $ 120,000 |  | $ 300,000 |

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