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Fair Value Measurements - Fair Value of Other Financial Instruments (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Fair value disclosures |  |
Long-term debt | $ 946,509 | $ 1,133,924
Current maturities | 0 | (188,000)
Long-term debt, excluding current maturities | 946,509 | 945,924
Carrying Amount |  |
Fair value disclosures |  |
Long-term debt | 946,509 | 1,133,924
Current maturities | 0 | (188,000)
Long-term debt, excluding current maturities | 946,509 | 945,924
Estimated Fair Value |  |
Fair value disclosures |  |
Long-term debt | 1,010,687 | 1,213,811
Current maturities | 0 | (189,332)
Long-term debt, excluding current maturities | $ 1,010,687 | $ 1,024,479

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