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Property and Equipment (Details) (USD $)
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Property and Equipment      
Depreciation expense $ 15,500,000 $ 9,300,000 $ 8,600,000
Amount of property and equipment      
Property and Equipment gross 141,931,000 104,330,000  
Accumulated depreciation and amortization 51,221,000 40,224,000  
Property and Equipment net 90,710,000 64,106,000  
Land
      
Amount of property and equipment      
Property and Equipment gross 5,008,000 5,231,000  
Leasehold improvements
      
Amount of property and equipment      
Property and Equipment gross 14,640,000 10,914,000  
Estimated Useful Lives minimum (in years) 5    
Estimated Useful Lives maximum (in years) 10    
Office equipment, furniture and fixtures
      
Amount of property and equipment      
Property and Equipment gross 6,467,000 6,151,000  
Estimated Useful Lives minimum (in years) 3    
Estimated Useful Lives maximum (in years) 7    
Computer equipment and software costs
      
Amount of property and equipment      
Property and Equipment gross 67,498,000 63,441,000  
Estimated Useful Lives minimum (in years) 3    
Estimated Useful Lives maximum (in years) 9    
Computer software costs      
Amortization expense related to computer software costs 6,100,000 4,200,000 4,000,000
Machinery and equipment
      
Amount of property and equipment      
Property and Equipment gross 48,318,000 18,593,000  
Estimated Useful Lives minimum (in years) 3    
Estimated Useful Lives maximum (in years) 45    
Internally developed software costs
      
Computer software costs      
Internally developed software costs 30,100,000 28,400,000  
Accumulated amortization 20,500,000 16,200,000  
Software development in progress
      
Computer software costs      
Internally developed software costs 7,700,000 9,400,000  
Capital leases
      
Amount of property and equipment      
Property and Equipment gross 4,200,000    
Accumulated depreciation and amortization $ 700,000