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Fair Value Measurements (Details) - USD ($) $ in Thousands | Mar. 31, 2019 | Dec. 31, 2018
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Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Debt instrument, carrying value | $ 488,024 | $ 518,711
6.25% Senior Notes due October 2021 |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Debt instrument, carrying value | 400,000 | 400,000
6.25% Senior Notes due October 2021 | Fair Value, Inputs, Level 2 |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Debt instrument, carrying value | 398,200 | 398,100
Debt instrument, fair value disclosure | 355,000 | 362,000
2017 Credit Facility | Credit Facility |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Debt instrument, carrying value | $ 89,000 | $ 119,000

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