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Supplementary Information Supplementary Information (Balance Sheet Disclosures) (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Other current assets:    
Income tax receivables $ 889 $ 1,932
Other current assets 97 102
Total other current assets 986 2,034
Long-term Debt, Current Maturities 16,927 13,021
Capital Lease Obligations, Current 324 246
Long-term Debt and Capital Lease Obligations, Current 17,251 13,267
Accrued Income Taxes, Current 1,120 509
Deferred Rent Credit, Current 241 208
Other liabilities 1,361 717
Accrued liabilities:    
Accrued salaries and wages 2,643 4,005
Accrued incentive compensation 6,412 8,237
Accrued vacation 2,417 2,305
Accrued insurance 1,832 1,726
Accrued interest 1,271 1,235
Accrued ad valorem and franchise taxes 1,003 981
Accrued commissions 461 543
Other accrued liabilities 1,520 1,059
Total accrued liabilities 17,559 20,091
Deferred Rent Credit, Noncurrent 966 1,207
Accrued Bonuses 1,287 575
Business Combination, Contingent Consideration, Liability, Noncurrent 1,125 785
Other long-term liabilities 3,378 2,567
Term Loan [Member] | Credit Agreement [Member]    
Other current assets:    
Long-term Debt, Current Maturities 15,000 11,250
Acquisition Debt, Deferred Purchase Price [Member] | Notes payable, other    
Other current assets:    
Long-term Debt, Current Maturities $ 1,927 $ 1,771