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Fair Value of Financial Assets and Liabilities - Schedule of Long Term Debt at Fair Value (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
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Cost |  |
Fair Value of Financial Assets and Liabilities |  |
Long-term debt, including current maturities, net | $ 1,064,904 | $ 786,227
Fair Value |  |
Fair Value of Financial Assets and Liabilities |  |
Long-term debt, including current maturities, net | 1,323,114 | 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 | 1,323,114 | 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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