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Income Taxes - Deferred Income Tax Balances (Detail) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Income Tax Disclosure [Abstract]    
U.S. foreign tax credit $ 7,027 $ 3,309
Stock and long-term compensation plans 2,304 2,817
Foreign NOL & other carryforwards 16,340 13,771
US state NOL carryforwards 803 248
US alternative minimum tax 357 395
Deferred revenue 358 672
Pension liability, net 624 0
Reserve for uncertain tax issues (445) (560)
Amortization and depreciation 708 627
Accrued expenses and other 523 288
Total gross deferred tax assets 28,599 21,567
Less: Valuation allowance (6,274) (13,719)
Net deferred income tax assets 22,325 7,848
Swiss tax allowances 691 851
US tax on unremitted foreign earnings 424 137
Deferred revenue   901
Intangible assets 10,947 8,008
Deferred tax liabilities 12,062 9,897
Net deferred tax assets $ 10,263  
Net deferred tax liabilities   $ (2,049)