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Income Taxes (Details 3) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Deferred income tax assets:    
Self insurance reserves $ 6,670 $ 7,464
Contract loss reserves 257 240
Stock-based awards 2,554 3,986
Bonus 2,908 2,497
Non-U.S. operating loss 595 373
Other 1,652 1,484
Total deferred income tax assets before valuation allowances 14,636 16,044
Less: valuation allowances (595) 0
Total deferred income tax assets 14,041 16,044
Deferred income tax liabilities:    
Property and equipment - tax over book depreciation (26,664) (25,859)
Intangible assets - tax over book amortization (3,592) (3,670)
Non-U.S. deferred income tax liabilities (91) 0
Other (2,259) (897)
Total deferred income tax liabilities (32,606) (30,426)
Net deferred income taxes $ (18,565) $ (14,382)