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Income Taxes - Income Tax Reconciliation (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Income Tax Expense (Benefit), Continuing Operations, Income Tax Reconciliation [Abstract]      
Tax provision at statutory U.S. rate $ 12,232 $ 13,753 $ 9,872
Increase (decrease) in tax provision resulting from:      
State and local taxes, net (554) (580) (397)
Foreign tax rate differential (5,762) (7,150) (3,804)
Nondeductible items 874 1,093 989
Federal research and development credits (678) (842) (1,149)
Change in deductibility of social insurance 649 688 214
Valuation allowance 621 661 520
Effective Income Tax Rate Reconciliation, Tax Settlement, Foreign, Amount (675) 0 0
Other 95 294 (172)
Total provision for income taxes $ 6,802 $ 7,917 $ 6,073