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Property And Equipment (Composition Of Property And Equipment) (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Property, Plant and Equipment [Line Items]    
Land $ 7,138 $ 7,138
Buildings and improvements 17,995 17,533
Furniture, equipment, and computer hardware and software 146,523 96,776
Leasehold improvements 33,692 34,377
Construction in progress 843 34,769
Property and equipment, gross 206,191 190,593
Accumulated depreciation and amortization (85,042) (74,530)
Property and equipment, net $ 121,149 $ 116,063
Estimated useful life, minimum (in years) 3  
Estimated useful life, maximum (in years) 40  
Land [Member]
    
Property, Plant and Equipment [Line Items]    
Estimated useful life (in years)     
Buildings And Improvements [Member]
    
Property, Plant and Equipment [Line Items]    
Estimated useful life, minimum (in years) 5  
Estimated useful life, maximum (in years) 40  
Furniture, Equipment, And Computer Hardware And Software [Member]
    
Property, Plant and Equipment [Line Items]    
Estimated useful life, minimum (in years) 5  
Estimated useful life, maximum (in years) 10  
Leasehold Improvements [Member]
    
Property, Plant and Equipment [Line Items]    
Estimated useful life, minimum (in years) 3  
Estimated useful life, maximum (in years) 10  
Construction In Progress [Member]
    
Property, Plant and Equipment [Line Items]    
Estimated useful life (in years)