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Income Taxes (Details 1) (USD $)
In Thousands, except Per Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Schedule Of Income Tax Exemption And Reduction [Line Items]    
Tax holiday effect $ 7,756us-gaap_IncomeTaxReconciliationTaxHolidays $ 6,175us-gaap_IncomeTaxReconciliationTaxHolidays
Basic net income per share effect $ 0.27us-gaap_IncomeLossFromExtraordinaryItemsNetOfTaxPerBasicShare $ 0.22us-gaap_IncomeLossFromExtraordinaryItemsNetOfTaxPerBasicShare
Diluted net income per share effect $ 0.27us-gaap_IncomeLossFromExtraordinaryItemsNetOfTaxPerDilutedShare $ 0.22us-gaap_IncomeLossFromExtraordinaryItemsNetOfTaxPerDilutedShare