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Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Deferred tax assets    
State tax $ 1,390 $ 2,518
Workers’ compensation 822 1,381
Health claims 487 755
Vacation liability 1,008 1,485
Allowance for doubtful accounts 104 123
Inventories 5,385 6,833
Sales incentive and advertising allowances 709 1,126
Acquisition costs 0 528
Unrealized foreign exchange gain or loss 291 678
Stock-based compensation 2,967 5,550
Foreign tax credit carryforwards 4,453 1,288
Uncertain tax positions’ unrecognized tax benefits 31 104
Foreign tax loss carry forward 6,892 6,841
Other 1,291 1,259
Deferred tax assets, gross 25,830 30,469
Less valuation allowances (11,114) (6,868)
Deferred tax assets, net, noncurrent 14,716 23,601
Deferred tax liabilities    
Depreciation (7,050) (6,138)
Goodwill and other intangibles amortization (11,331) (14,126)
Tax effect on cumulative translation adjustment (487) (667)
Other 0 (744)
Deferred tax liabilities (18,868) (21,675)
Total Deferred tax   1,926
Total Deferred tax 4,152  
Operating loss carryforwards    
Deferred tax assets, net, noncurrent 14,716 23,601
Pre-tax loss carryforwards 32,100  
Deferred tax asset valuation allowance 11,114 6,868
Increase (decrease) in the valuation allowance $ 4,200 $ (700)