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Long-Term Debt - Schedule of Debt (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020 | Sep. 30, 2019
--- | --- | --- | ---
Debt Instrument [Line Items] |  |  |
Total long term debt | $ 567,074 | $ 565,312 |
Less: current maturities | (24,557) | (23,355) |
Long-term debt, less current maturities | 542,517 | 541,957 |
Senior Notes | 5.75% Senior Notes Due 2028 |  |  |
Debt Instrument [Line Items] |  |  |
Total long term debt | 296,217 | 295,770 |
Unamortized debt issuance costs | 3,783 | 4,230 |
Notes payable interest rate (as a percent) |  |  | 5.75%
Medium-term Notes | Term Loan Agreement |  |  |
Debt Instrument [Line Items] |  |  |
Total long term debt | 198,906 | 198,657 |
Unamortized debt issuance costs | 1,094 | 1,343 |
Notes Payable |  |  |
Debt Instrument [Line Items] |  |  |
Total long term debt | $ 3,192 | $ 3,392 |
Notes Payable | Minimum |  |  |
Debt Instrument [Line Items] |  |  |
Notes payable interest rate (as a percent) | 2.00% | 2.00% |
Notes Payable | Maximum |  |  |
Debt Instrument [Line Items] |  |  |
Notes payable interest rate (as a percent) | 5.00% | 5.00% |
Notes Payable | Vehicle and Equipment |  |  |
Debt Instrument [Line Items] |  |  |
Total long term debt | $ 68,759 | $ 67,493 |
Notes Payable | Vehicle and Equipment | Minimum |  |  |
Debt Instrument [Line Items] |  |  |
Notes payable interest rate (as a percent) | 1.90% | 1.90% |
Notes Payable | Vehicle and Equipment | Maximum |  |  |
Debt Instrument [Line Items] |  |  |
Notes payable interest rate (as a percent) | 4.80% | 4.80% |

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