Income Taxes - Income Tax Reconciliation (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Tax Expense (Benefit), Continuing Operations, Income Tax Reconciliation [Abstract]
Tax provision at statutory U.S. rate	$ 13,753	$ 9,872	$ 8,377
Increase (decrease) in tax provision resulting from:
State and local taxes, net	(580)	(397)	(246)
Foreign tax rate differential	(7,150)	(3,804)	(3,488)
Nondeductible items	1,093	989	388
Federal research and development credits	(842)	(1,149)	(369)
Change in deductibility of social insurance	688	214	617
Valuation allowance	661	520	2,592
Other	294	(172)	214
Total provision for income taxes	$ 7,917us-gaap_IncomeTaxExpenseBenefit	$ 6,073us-gaap_IncomeTaxExpenseBenefit	$ 8,085us-gaap_IncomeTaxExpenseBenefit

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Income Tax Reconciliation, Change in Deductibility of Social Insurance

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to increase (decrease) in the valuation allowance for deferred tax assets.

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The amount of income tax expense or benefit for the period computed by applying the domestic federal statutory tax rates to pretax income from continuing operations.

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