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Lease and Financing Obligations (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
New Building [Abstract]      
Value of New Building $ 750,826 $ 678,457  
Accumulated depreciation 286,239 233,725  
Deposit paid to landlord 43,375 38,858  
Operating Leases, Minimum Future Obligations [Abstract]      
2018 41,788    
2019 27,088    
2020 14,907    
2021 10,036    
2022 7,672    
Thereafter 13,250    
Total 114,741    
Financing Obligations, Minimum Future Obligations [Abstract]      
2018 736    
2019 758    
2020 781    
2021 790    
2022 804    
Thereafter 2,027    
Total minimum lease payments 5,896    
Rent expense for operating leases 50,700 48,200 $ 52,400
Interest expense associated with financing obligation $ 200 200 $ 100
New Regional Headquarters Building [Member]      
New Building [Abstract]      
Extension period for lease 10 years    
Initial term of lease 10 years    
Value of New Building $ 20,800 18,900  
Accumulated depreciation 1,500 800  
Financing obligation 10,800 10,000  
Deposit paid to landlord 10,300 9,100  
Tenant incentive asset 4,900 4,900  
Deferred tenant incentive liability $ 4,500 $ 4,500  
Office Space and Computer Hardware [Member]      
New Building [Abstract]      
Extension period for lease 3 years