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Supplementary Data (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Other current assets:      
Prepaid expenses $ 1,913   $ 1,919
Other current assets 163   157
Total other current assets 2,076   2,076
Current portion of acquisition debt 913   1,027
Current portion of finance lease obligations 331   323
Current portion of operating lease obligations 2,057   2,082
Total current portion of debt and lease obligations 3,301   3,432
Accrued liabilities:      
Accrued salaries and wages 3,307   1,392
Accrued incentive compensation 5,964   11,139
Accrued vacation 3,440   3,271
Accrued insurance 3,507   3,016
Accrued interest 8,888   2,291
Accrued ad valorem and franchise taxes 1,059   435
Employer payroll tax deferral 1,773   1,773
Accrued commissions 912   634
Other accrued liabilities 1,097   908
Income tax payable 4,392   798
Federal income taxes payable 1,604   1,825
Unrecognized tax benefit 3,656   3,656
Total accrued liabilities 39,599   31,138
Other long-term liabilities:      
Incentive compensation 351   2,975
Total other long-term liabilities 2,677   4,748
Employer Payroll Tax Deferral, Non-Current 1,773   1,773
Accrued Severance 553   $ 0
Cash Paid For Interest And Financing Costs 616 $ 1,337  
Income Taxes Paid 532 96  
Contribution of Property $ 635 $ 0