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Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2014
Dec. 31, 2015
Deferred tax assets      
State tax $ 2,518   $ 1,762
Workers’ compensation 1,381   1,777
Health claims 755   746
Vacation liability 1,485   1,410
Allowance for doubtful accounts 123   205
Inventories 6,833   6,112
Sales incentive and advertising allowances 1,126   963
Acquisition costs 528   0
Unrealized foreign exchange gain or loss 678   247
Stock-based compensation 5,550   5,629
Foreign tax credit carryforwards 1,288   1,345
Uncertain tax positions’ unrecognized tax benefits 104   134
Foreign tax loss carry forward 6,841   7,082
Other 1,259   1,433
Deferred tax assets, gross 30,469   28,845
Less valuation allowances (6,868)   (7,576)
Deferred tax assets, net, noncurrent 23,601   21,269
Deferred tax liabilities      
Depreciation (6,138)   (5,265)
Goodwill and other intangibles amortization (14,126)   (11,835)
Tax effect on cumulative translation adjustment (667)   (974)
Other (744)   (1,023)
Deferred tax liabilities (21,675)   (19,097)
Total Deferred tax 1,926   2,172
Operating loss carryforwards      
Deferred tax assets, net, current 0   (16,203)
Deferred tax assets, net, noncurrent 23,601   21,269
Deferred tax asset valuation allowance 6,868   7,576
Increase (decrease) in the valuation allowance (700) $ (800)  
Undistributed earnings indefinitely reinvested 57,700 $ 45,600 $ 51,600
Foreign      
Operating loss carryforwards      
Pre-tax loss carryforwards 30,800    
Pre-tax loss carryforwards, 2017 1,500    
Pre-tax loss carryforwards, 2018 1,200    
Pre-tax loss carryforwards, 2019 1,700    
Pre-tax loss carryforwards, 2020 1,500    
Pre-tax loss carryforwards, 2021 300    
Pre-tax loss carryforwards, 2022 92    
Pre-tax loss carryforwards, 2023 300    
Accounting Standards Update 2015-07      
Deferred tax assets      
Deferred tax assets, net, noncurrent 4,300    
Operating loss carryforwards      
Deferred tax assets, net, current 4,100    
Deferred tax liabilities, net, current 1,900    
Deferred tax assets, net, noncurrent 4,300    
Deferred tax liabilities, net, noncurrent 2,400    
Beijing And Thailand | Foreign      
Operating loss carryforwards      
Pre-tax loss carryforwards $ 4,300