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Property and Equipment (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Property, Plant and Equipment [Line Items]      
Property and equipment, gross $ 204,809 $ 177,022  
Less: accumulated depreciation (96,672) (83,718)  
Property and equipment, net 108,137 93,304  
Depreciation expense 14,285 12,377 10,743
Land
      
Property, Plant and Equipment [Line Items]      
Property and equipment, gross 11,816 10,481  
Buildings
      
Property, Plant and Equipment [Line Items]      
Property and equipment, gross 17,895 12,386  
Furniture, fixtures, equipment and leasehold improvements
      
Property, Plant and Equipment [Line Items]      
Property and equipment, gross $ 175,098 $ 154,155