Contractual interest rate for funds borrowed, under the debt agreement.

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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%