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Supplementary Information Supplementary Information (Balance Sheet Disclosures) (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Other Current Assets:    
Deferred taxes $ 4,256 $ 3,750
Income tax receivables 279 3,293
Other current assets 172 101
Total other current assets 4,707 7,144
Accrued Liabilities:    
Accrued salaries and wages 2,383 2,073
Accrued incentive compensation 5,862 5,660
Accrued vacation 2,239 1,978
Accrued insurance 2,246 2,171
Accrued interest 1,295 1,232
Accrued ad valorem and franchise taxes 604 537
Accrued commissions 470 654
Other accrued liabilities 1,442 898
Total accrued liabilities $ 16,541 $ 15,203