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Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Deferred tax assets |  |
State tax | $ 919 | $ 1,390
Workers’ compensation | 785 | 822
Health claims | 445 | 487
Vacation liability | 370 | 1,008
Allowance for doubtful accounts | 171 | 104
Inventories | 5,659 | 5,385
Sales incentive and advertising allowances | 799 | 709
Stock-based compensation | 3,074 | 2,967
Unrealized foreign exchange gain or loss | 440 | 291
Foreign tax credit carryforwards | 5,043 | 4,453
Uncertain tax positions’ unrecognized tax benefits | 39 | 31
Foreign tax loss carry forward | 8,091 | 6,892
Other | 1,813 | 1,291
Deferred tax assets, gross | 27,648 | 25,830
Less valuation allowances | 13,254 | 11,114
Deferred tax assets, net, noncurrent | 14,394 | 14,716
Deferred tax liabilities |  |
Depreciation | (9,189) | (7,050)
Goodwill and other intangibles amortization | (13,027) | (11,331)
Tax effect on cumulative translation adjustment | (497) | (487)
Deferred tax liabilities | (22,713) | (18,868)
Total Deferred tax asset/(liability) | (8,319) | (4,152)
Operating loss carryforwards |  |
Deferred tax assets, net, noncurrent | 14,394 | $ 14,716
Pre-tax loss carryforwards | $ 37,000 |

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