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Property and Equipment (Details) (USD $)
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Property, Plant and Equipment [Line Items]      
Property and equipment, gross $ 372,130,000 $ 293,763,000  
Less: accumulated depreciation (142,343,000) (144,258,000)  
Property and equipment, net 229,787,000 149,505,000  
Depreciation expense 25,500,000 25,700,000 22,700,000
Land [Member]
     
Property, Plant and Equipment [Line Items]      
Property and equipment, gross 30,411,000 19,561,000  
Buildings [Member]
     
Property, Plant and Equipment [Line Items]      
Property and equipment, gross 38,723,000 41,495,000  
Construction in Progress [Member]
     
Property, Plant and Equipment [Line Items]      
Property and equipment, gross 85,584,000 14,286,000  
Furniture and Fixtures [Member]
     
Property, Plant and Equipment [Line Items]      
Property and equipment, gross 49,062,000 48,071,000  
Computers and Equipment [Member]
     
Property, Plant and Equipment [Line Items]      
Property and equipment, gross 99,804,000 92,336,000  
Leasehold Improvements [Member]
     
Property, Plant and Equipment [Line Items]      
Property and equipment, gross 49,027,000 60,120,000  
Vehicles [Member]
     
Property, Plant and Equipment [Line Items]      
Property and equipment, gross 2,229,000 2,153,000  
Scanners [Member]
     
Property, Plant and Equipment [Line Items]      
Property and equipment, gross $ 17,290,000 $ 15,741,000