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Fair Value Measurements - Fair Value of Other Financial Instruments (Details) - USD ($) $ in Thousands | Sep. 30, 2017 | Dec. 31, 2016
--- | --- | ---
Fair value disclosures |  |
Debt, net | $ 1,291,000 | $ 1,528,000
Current maturities | (237,000) | 0
Long-term debt, excluding current maturities | 1,284,551 | 1,520,530
Carrying Amount |  |
Fair value disclosures |  |
Debt, net | 1,521,551 | 1,520,530
Current maturities | (237,000) | 0
Long-term debt, excluding current maturities | 1,284,551 | 1,520,530
Estimated Fair Value |  |
Fair value disclosures |  |
Debt, net | 1,536,360 | 1,463,643
Current maturities | (243,569) | 0
Long-term debt, excluding current maturities | $ 1,292,791 | $ 1,463,643

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