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Goodwill and Intangible Assets - Change in Goodwill (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Goodwill [Roll Forward]      
Beginning of year $ 23,577 $ 23,577 $ 23,577
Acquired goodwill 6,340 0 0
Impairment 0 0 0
End of year $ 29,917 $ 23,577 $ 23,577