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Lease and Financing Obligations (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
New Building [Abstract]      
Value of New Building $ 787,534 $ 750,826  
Accumulated depreciation 322,999 286,239  
Deposit paid to landlord 41,986 43,375  
Operating Leases, Minimum Future Obligations [Abstract]      
2019 39,358    
2020 27,553    
2021 20,266    
2022 11,723    
2023 9,950    
Thereafter 7,628    
Total minimum lease payments 116,478    
Financing Obligations, Minimum Future Obligations [Abstract]      
2019 726    
2020 748    
2021 757    
2022 770    
2023 794    
Thereafter 1,148    
Total minimum lease payments 4,943    
Rent expense for operating leases 50,400 50,700 $ 48,200
Interest expense associated with financing obligation $ 200 200 $ 200
New Regional Headquarters Building [Member]      
New Building [Abstract]      
Extension period for lease 10 years    
Initial term of lease 10 years    
Value of New Building $ 19,400 20,800  
Financing obligation 9,900 10,800  
Deposit paid to landlord 9,900 10,300  
Tenant incentive asset 4,000 4,900  
Deferred tenant incentive liability $ 3,700 $ 4,500  
Office Space and Computer Hardware [Member]      
New Building [Abstract]      
Extension period for lease 3 years