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Fair Value Measurements - Debt Measured at Fair Value (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Fair value disclosures |  |
Long-term debt | $ 1,226,104 | $ 1,521,891
Current maturities | 0 | (304,000)
Long-term debt, net | 1,226,104 | 1,217,891
Carrying Amount |  |
Fair value disclosures |  |
Long-term debt | 1,226,104 | 1,521,891
Current maturities | 0 | (304,000)
Long-term debt, net | 1,226,104 | 1,217,891
Estimated Fair Value |  |
Fair value disclosures |  |
Long-term debt | 1,202,994 | 1,527,624
Current maturities | 0 | (312,055)
Long-term debt, net | $ 1,202,994 | $ 1,215,569

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