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Supplementary Data (Details) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Other current assets:      
Prepaid expenses $ 2,018   $ 1,919
Other current assets 124   157
Total other current assets 2,191   2,076
Acquisition debt 730   1,027
Finance lease obligations 357   323
Operating lease obligations 1,954   2,082
Total current portion of debt and lease obligations 3,041   3,432
Accrued liabilities:      
Accrued salaries and wages 3,533   1,392
Accrued incentive compensation 13,472   11,139
Accrued vacation 3,222   3,271
Accrued insurance 3,995   3,016
Accrued interest 6,572   2,291
Accrued ad valorem and franchise taxes 2,115   435
Employer payroll tax deferral 1,773   1,773
Accrued commissions 861   634
Other accrued liabilities 500   908
Income tax payable 799   798
Federal income taxes payable 1,460   1,024
Unrecognized tax benefit 3,735   3,656
Total accrued liabilities 43,147   31,138
Other long-term liabilities:      
Incentive compensation 995   2,975
Total other long-term liabilities 3,045   4,748
Employer Payroll Tax Deferral, Non-Current 1,773   1,773
Accrued Severance 277   0
Cash Paid For Interest And Financing Costs 14,817 $ 16,960  
Income Taxes Paid 9,974 (6,817)  
Contribution of Property 635 $ 0  
State income taxes receivable      
Other current assets:      
Income taxes receivable $ 49   $ 0