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Note 13 - Components of Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Goodwill and intangible assets $ 23,624
Accrued expenses $ 18,982 18,191
Deferred revenue 9,389 7,945
Inventories 9,772 9,177
Pension obligations 7,684 8,738
Stock-based compensation 7,974 8,628
Operating loss and credit carryforwards 15,677 10,047
Other 2,842 1,428
Valuation allowance (1,523) (1,385)
Total deferred tax assets 70,797 $ 86,393
Goodwill and intangible assets 12,455
Depreciation 19,507 $ 18,535
Debt refinancing costs 7,732 10,925
Prepaid expenses 1,241 1,032
Total deferred tax liabilities 40,935 30,492
Net deferred tax assets $ 29,862 $ 55,901