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Supplementary Data (Details) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Other current assets:      
Prepaid expenses $ 1,702   $ 1,919
Other current assets 149   157
Total other current assets 2,862   2,076
Current portion of acquisition debt 814   1,027
Current portion of finance lease obligations 340   323
Current portion of operating lease obligations 2,018   2,082
Total current portion of debt and lease obligations 3,172   3,432
Accrued liabilities:      
Accrued salaries and wages 4,756   1,392
Accrued incentive compensation 9,144   11,139
Accrued vacation 3,433   3,271
Accrued insurance 3,432   3,016
Accrued interest 2,308   2,291
Accrued ad valorem and franchise taxes 1,593   435
Employer payroll tax deferral 1,773   1,773
Accrued commissions 791   634
Other accrued liabilities 922   908
Income tax payable 0   798
Federal income taxes payable 1,809   1,825
Unrecognized tax benefit 3,710   3,656
Total accrued liabilities 33,671   31,138
Other long-term liabilities:      
Incentive compensation 972   2,975
Total other long-term liabilities 3,162   4,748
Employer Payroll Tax Deferral, Non-Current 1,773   1,773
Accrued Severance 417   0
Cash Paid For Interest And Financing Costs 14,329 $ 15,910  
Income Taxes Paid 7,663 177  
Contribution of Property 635 $ 0  
State income taxes receivable      
Other current assets:      
Income taxes receivable 513   0
Federal income taxes receivable      
Other current assets:      
Income taxes receivable $ 498   $ 0