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Income Taxes (Schedule of Deferred Tax Assets and Liabilities) (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Deferred income tax assets:    
Inventory basis difference $ 1,568 $ 2,241
Accounts receivable reserve 231 529
Depreciation 0 110
Stock based compensation 937 968
Pension liability 3,947 2,481
Employee benefit accrual 1,481 2,038
Product liability and warranty reserves 1,600 1,517
Expenses not currently deductible for tax purposes 28 60
Foreign net operating loss 3,513 2,726
State net operating loss 102 49
Other 94 194
Total deferred income tax assets 13,501 12,913
Less: Valuation allowance (3,382) (1,651)
Net deferred income tax assets 10,119 11,262
Deferred income tax liabilities:    
Inventory basis differences (16) (310)
Depreciation (5,289) (4,624)
Intangible assets (10,046) (7,934)
Deferred revenue 0 0
Expenses not currently deductible for tax purposes (593) (642)
Total deferred income tax liabilities (15,944) (13,510)
Net deferred income taxes $ (5,825) $ (2,248)