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Supplementary Data (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Other current assets:    
Other current assets $ 136 $ 97
Total other current assets 2,798 986
Current portion of long-term debt and capital lease obligations:    
Long-term Debt 2,118 16,927
Capital leases 327 324
Total current portion of long-term debt and capital lease obligations 2,445 17,251
Other current liabilities:    
Federal income taxes payable 633 1,120
Deferred rent 265 241
Total other current liabilities 898 1,361
Accrued liabilities:    
Accrued salaries and wages 1,428 2,643
Accrued incentive compensation 4,505 6,412
Accrued vacation 2,602 2,417
Accrued insurance 1,933 1,832
Accrued interest 7,299 1,271
Accrued ad valorem and franchise taxes 2,099 1,003
Accrued commissions 499 461
Other accrued liabilities 1,300 1,520
Total accrued liabilities 21,665 17,559
Other long-term liabilities:    
Deferred rent 765 966
Incentive compensation 1,263 1,287
Contingent consideration 1,127 1,125
Total other long-term liabilities 3,155 3,378
Term Loan [Member] | Credit Agreement [Member]    
Current portion of long-term debt and capital lease obligations:    
Long-term Debt 0 15,000
Acquisition Debt, Deferred Purchase Price [Member] | Notes Payable, Other Payables [Member]    
Current portion of long-term debt and capital lease obligations:    
Long-term Debt 2,118 1,927
Federal income taxes receivable    
Other current assets:    
State income taxes receivable 1,383 0
State income taxes receivable    
Other current assets:    
State income taxes receivable $ 1,279 $ 889