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Accumulated Other Comprehensive Loss - Schedule of Accumulated Other Comprehensive Income (Loss) (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Changes in accumulated other comprehensive loss      
Balance, beginning of year $ (2,091)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax    
Other comprehensive loss (15,520)us-gaap_OtherComprehensiveIncomeLossNetOfTax (451)us-gaap_OtherComprehensiveIncomeLossNetOfTax (381)us-gaap_OtherComprehensiveIncomeLossNetOfTax
Balance, end of year (17,611)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax (2,091)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax  
Foreign Currency Translation      
Changes in accumulated other comprehensive loss      
Balance, beginning of year (6,715)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedTranslationAdjustmentMember
   
Other comprehensive loss (15,349)us-gaap_OtherComprehensiveIncomeLossNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedTranslationAdjustmentMember
   
Balance, end of year (22,064)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedTranslationAdjustmentMember
   
Net Unrealized Gains (Losses) on Investments      
Changes in accumulated other comprehensive loss      
Balance, beginning of year 4,624us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember
   
Other comprehensive loss (171)us-gaap_OtherComprehensiveIncomeLossNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember
   
Balance, end of year $ 4,453us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember