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Consolidated Statements of Comprehensive Income (Parenthetical) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Statement of Comprehensive Income [Abstract]      
Foreign currency translation adjustments, tax $ 0us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentTax $ 0us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentTax $ 0us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentTax
Change in marketable securities, tax $ 0us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesTax $ 0us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesTax $ 0us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesTax