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Income Taxes (Schedule of Deferred Tax Assets and Liabilities) (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Deferred tax assets:    
Inventories $ 2,135 $ 1,921
Compensation and benefits 1,225 2,647
Accrued liabilities and reserves 4,181 5,187
Property, plant and equipment 647 1,045
Tax loss carryforwards 8,437 10,929
Tax credit carryforwards 26,221 29,744
Other 410 416
Gross deferred tax assets 43,256 51,889
Less: Valuation allowance (8,962) (11,986)
Deferred tax assets less valuation allowance 34,294 39,903
Deferred tax liabilities:    
Property, plant and equipment (2,545) (3,489)
Intangible assets (16,683) (22,067)
Outside basis difference in foreign subsidiary (13,750) (13,750)
Other (4,090) (3,243)
Gross deferred tax liabilities (37,068) (42,549)
Net deferred tax liabilities $ (2,774) $ (2,646)