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Commitments and Contingencies Future Lease Payments (Details) (USD $)
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Commitments and Contingencies [Abstract]      
Remaining lease terms expire over the next 6 years    
Future lease payments for non-cancelable operating and capital leases, in years 5 years    
Operating Leases, Future Minimum Payments Due [Abstract]      
Operating leases, future minimum payments due, current $ 7,014,000    
Operating leases, future minimum payments, due in two years 6,332,000    
Operating leases, future minimum payments, due in three years 4,829,000    
Operating leases, future minimum payments, due in four years 3,415,000    
Operating leases, future minimum payments, due in five years 1,931,000    
Operating leases, future minimum payments, due thereafter 603,000    
Operating leases, future minimum payments due 24,124,000    
Capital Leases, Future Minimum Payments Due [Abstract]      
Capital leases, future minimum payments due, current 1,130,000    
Capital leases, future minimum payments due in two years 1,039,000    
Capital leases, future minimum payments due in three years 341,000    
Capital leases, future minimum payments due in four years 0    
Capital leases, future minimum payments due in five years 0    
Capital leases, future minimum payments due thereafter 0    
Capital leases, future minimum payments due 2,510,000    
Future interest charges included in capital lease payments 100,000    
Facilities rent expense $ 5,200,000 $ 5,100,000 $ 8,900,000