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Summary of Business and Significant Accounting Policies (Tables)
12 Months Ended
Dec. 31, 2020
Accounting Policies [Abstract]  
Depreciation and Amortization Policies for Property and Equipment Our depreciation and amortization policies are as follows:
Buildings
Lesser of lease term or 35 years
Leasehold improvementsLesser of lease term or useful life
Furniture and fixtures
5 to 15 years
Equipment, general office and computer
3 to 5 years
Software developed for internal use
3 to 5 years
Property and equipment, net consists of the following (in thousands):
 December 31,
 20202019
Buildings and leasehold improvements$37,766 $163,881 
Furniture, fixtures and equipment38,290 38,878 
Computer equipment391,126 397,454 
Software developed for internal use1,891,718 1,857,353 
Property and equipment2,358,900 2,457,566 
Accumulated depreciation and amortization(1,995,409)(1,815,844)
Property and equipment, net$363,491 $641,722