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Income Taxes (Schedule of Deferred Tax Assets and Liabilities) (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Deferred tax assets:    
Inventories $ 1,921 $ 2,156
Compensation and benefits 2,647 4,785
Insurance   245
Accrued liabilities and reserves 5,187 4,758
Property, plant and equipment 1,045 1,310
Tax loss carryforwards 10,929 28,952
Tax credit carryforwards 29,744 14,135
Other 416 2,851
Gross deferred tax assets 51,889 59,192
Less: Valuation allowance (11,986) (11,125)
Deferred tax assets less valuation allowance 39,903 48,067
Deferred tax liabilities:    
Property, plant and equipment (3,489) (1,651)
Intangible assets (22,067) (13,260)
Outside basis difference in foreign subsidiary (13,750) (31,016)
Other (3,243) (1,358)
Gross deferred tax liabilities (42,549) (47,285)
Net deferred tax assets (liabilities) (2,646) 782
Net deferred tax (liabilities) $ (2,646) $ 782