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Fair Value of Financial Assets and Liabilities (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2021 | Dec. 31, 2020
Fair Value of Financial Assets and Liabilities |  |
Risk premium (as a percent) | 1.83% |
Cost |  |
Fair Value of Financial Assets and Liabilities |  |
Long-term debt, including current maturities, net | $ 786,087 | $ 786,227
Fair Value |  |
Fair Value of Financial Assets and Liabilities |  |
Long-term debt, including current maturities, net | 860,403 | 944,447
Fair Value | Level 1 |  |
Fair Value of Financial Assets and Liabilities |  |
Long-term debt, including current maturities, net | 0 | 0
Fair Value | Level 2 |  |
Fair Value of Financial Assets and Liabilities |  |
Long-term debt, including current maturities, net | 860,403 | 944,447
Fair Value | Level 3 |  |
Fair Value of Financial Assets and Liabilities |  |
Long-term debt, including current maturities, net | $ 0 | $ 0

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- Definition Represents the aggregate of total long-term debt, including current maturities and short-term debt. + References No definition available. + Details
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