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Property and Equipment (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Property, Plant and Equipment [Line Items]      
Property and equipment, gross $ 177,022 $ 144,986  
Less: accumulated depreciation (83,718) (71,535)  
Property and equipment, net 93,304 73,451  
Depreciation expense 12,387 10,761 10,229
Land
     
Property, Plant and Equipment [Line Items]      
Property and equipment, gross 10,481 9,108  
Buildings
     
Property, Plant and Equipment [Line Items]      
Property and equipment, gross 12,386 10,705  
Furniture, fixtures, equipment and leasehold improvements
     
Property, Plant and Equipment [Line Items]      
Property and equipment, gross $ 154,155 $ 125,173