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Fair Value Measurements (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Fair Value on Non-Recurring Basis |  |  |
Gross carrying value | $ 751,955 |  |
Amount of transfers of assets and liabilities measured on a recurring and non-recurring basis between Levels 1, 2 and 3 of the fair value hierarchy | 0 | $ 0 | $ 0
Senior Notes 5.625% |  |  |
Fair Value on Non-Recurring Basis |  |  |
Gross carrying value | 400,000 |  |
Fair Value on Non-Recurring Basis | Level 1 fair value measurement | Senior Notes 5.625% |  |  |
Fair Value on Non-Recurring Basis |  |  |
Fair value | $ 372,000 |  |

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