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Business Combinations - Schedule of Goodwill (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Jun. 30, 2013
Dec. 31, 2012
Goodwill [Roll Forward]    
Beginning of period $ 93,404 $ 89,878
Acquired goodwill 0  
Goodwill, Purchase Accounting Adjustments (1,116)  
Impairment 0  
End of period $ 92,288 $ 89,878