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Goodwill (Schedule of Goodwill) (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Goodwill [Roll Forward]      
Goodwill, Balance at the beginning of the period $ 32,073us-gaap_Goodwill $ 31,648us-gaap_Goodwill $ 31,751us-gaap_Goodwill
Translation adjustment (2,217)us-gaap_GoodwillTranslationAdjustments 425us-gaap_GoodwillTranslationAdjustments 553us-gaap_GoodwillTranslationAdjustments
Goodwill impairment 0us-gaap_GoodwillImpairmentLoss 0us-gaap_GoodwillImpairmentLoss (656)us-gaap_GoodwillImpairmentLoss
Goodwill acquired 42,551us-gaap_GoodwillAcquiredDuringPeriod    
Goodwill, balance at the end of the period $ 72,407us-gaap_Goodwill $ 32,073us-gaap_Goodwill $ 31,648us-gaap_Goodwill