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Property Assets Property Assets (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Property, Plant and Equipment [Line Items]      
Software $ 279,141 $ 300,690  
Building and leasehold improvements 196,179 207,620  
Furniture and equipment 163,623 174,741  
Transportation equipment 503 567  
Construction in progress 7,269 5,346  
Total property assets 646,715 688,964  
Accumulated depreciation of property assets (505,074) (522,826)  
Property assets, net of accumulated depreciation of $505,074 and $522,826 in 2020 and 2019, respectively 141,641 166,138  
Capitalized software costs included in construction in progress 4,800 3,800  
Cost of internally developed software placed in service 9,500 6,000 $ 9,700
Proceeds from sale of corporate headquarters 43,200    
Gain on sale of corporate headquarters 21,800 $ 21,800  
Corporate headquarters lease terms   The lease includes an initial term of 12 years, with two five year renewal option periods at our discretion  
Operating lease right-of-use assets 283,422 $ 281,566  
Corporate Headquarters [Member]      
Property, Plant and Equipment [Line Items]      
Operating lease right-of-use assets $ 19,000    
Building and building improvements [Member]      
Property, Plant and Equipment [Line Items]      
Write-off   14,000  
Land and land improvements [Member]      
Property, Plant and Equipment [Line Items]      
Write-off   $ 6,700