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Property and Equipment (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Composition of property and equipment    
Property and equipment, gross $ 217,955 $ 206,191
Accumulated depreciation and amortization (96,435) (85,042)
Property and equipment, net 121,520 121,149
Land [Member]
   
Composition of property and equipment    
Estimated useful life (years)     
Property and equipment, gross 7,138 7,138
Buildings and Improvements [Member]
   
Composition of property and equipment    
Property and equipment, gross 18,188 17,995
Buildings and Improvements [Member] | Minimum [Member]
   
Composition of property and equipment    
Estimated useful life (years) 5 years  
Buildings and Improvements [Member] | Maximum [Member]
   
Composition of property and equipment    
Estimated useful life (years) 40 years  
Furniture, Equipment, and Computer Hardware and Software [Member]
   
Composition of property and equipment    
Property and equipment, gross 153,597 146,523
Furniture, Equipment, and Computer Hardware and Software [Member] | Minimum [Member]
   
Composition of property and equipment    
Estimated useful life (years) 5 years  
Furniture, Equipment, and Computer Hardware and Software [Member] | Maximum [Member]
   
Composition of property and equipment    
Estimated useful life (years) 10 years  
Leasehold Improvements [Member]
   
Composition of property and equipment    
Property and equipment, gross 38,362 33,692
Leasehold Improvements [Member] | Minimum [Member]
   
Composition of property and equipment    
Estimated useful life (years) 3 years  
Leasehold Improvements [Member] | Maximum [Member]
   
Composition of property and equipment    
Estimated useful life (years) 10 years  
Construction In Progress [Member]
   
Composition of property and equipment    
Estimated useful life (years)     
Property and equipment, gross $ 670 $ 843