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Long-Term Debt - Schedule of Debt (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020 | Sep. 30, 2019
--- | --- | --- | ---
Debt Instrument [Line Items] |  |  |
Total long term debt | $ 568,908 | $ 565,312 |
Less: current maturities | (23,770) | (23,355) |
Long-term debt, less current maturities | 545,138 | 541,957 |
Senior Notes | 5.75% Senior Notes Due 2028 |  |  |
Debt Instrument [Line Items] |  |  |
Total long term debt | 295,919 | 295,770 |
Unamortized debt issuance costs | 4,081 | 4,230 |
Notes payable interest rate |  |  | 5.75%
Medium-term Notes | Term Loan Agreement |  |  |
Debt Instrument [Line Items] |  |  |
Total long term debt | 198,740 | 198,657 |
Unamortized debt issuance costs | 1,260 | 1,343 |
Notes Payable |  |  |
Debt Instrument [Line Items] |  |  |
Total long term debt | $ 5,428 | 3,392 |
Notes Payable | Minimum |  |  |
Debt Instrument [Line Items] |  |  |
Notes payable interest rate | 1.00% |  |
Notes Payable | Maximum |  |  |
Debt Instrument [Line Items] |  |  |
Notes payable interest rate | 5.00% |  |
Notes Payable | Vehicle and Equipment |  |  |
Debt Instrument [Line Items] |  |  |
Total long term debt | $ 68,821 | $ 67,493 |
Notes Payable | Vehicle and Equipment | Minimum |  |  |
Debt Instrument [Line Items] |  |  |
Notes payable interest rate | 1.90% |  |
Notes Payable | Vehicle and Equipment | Maximum |  |  |
Debt Instrument [Line Items] |  |  |
Notes payable interest rate | 4.80% |  |

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