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Note 13 - Income Taxes - Components of Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Accrued expenses $ 15,138 $ 22,758
Deferred revenue 8,060 10,645
Inventories 7,933 10,159
Pension obligations 3,795 7,512
Stock-based compensation 5,522 7,291
Operating loss and credit carryforwards 23,771 20,927
Other 1,064 2,822
Valuation allowance (6,817) (4,362)
Total deferred tax assets 58,466 77,752
Goodwill and intangible assets 70,556 58,133
Depreciation 22,563 25,194
Debt refinancing costs 5,189 7,193
Prepaid expenses 709 1,173
Total deferred tax liabilities 99,017 91,693
Net deferred tax liabilities $ (40,551) $ (13,941)