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Goodwill and Intangible Assets - Change in Goodwill (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Goodwill [Roll Forward]      
Beginning of year $ 29,917us-gaap_Goodwill $ 23,577us-gaap_Goodwill  
Acquired goodwill 0us-gaap_GoodwillAcquiredDuringPeriod 6,340us-gaap_GoodwillAcquiredDuringPeriod 0us-gaap_GoodwillAcquiredDuringPeriod
Impairment 0us-gaap_GoodwillImpairmentLoss 0us-gaap_GoodwillImpairmentLoss 0us-gaap_GoodwillImpairmentLoss
End of year $ 29,917us-gaap_Goodwill $ 29,917us-gaap_Goodwill $ 23,577us-gaap_Goodwill