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Income Taxes Income taxes (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Income Tax Holiday [Line Items]    
Deferred Tax Liabilities, Undistributed Foreign Earnings $ (29,268)us-gaap_DeferredTaxLiabilitiesUndistributedForeignEarnings $ (20,748)us-gaap_DeferredTaxLiabilitiesUndistributedForeignEarnings
Undistributed Earnings of Foreign Subsidiaries $ 64,147us-gaap_UndistributedEarningsOfForeignSubsidiaries $ 42,750us-gaap_UndistributedEarningsOfForeignSubsidiaries