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Property and Equipment
 12 Months Ended
Dec. 31, 2021
Property, Plant and Equipment [Abstract]  
Property and Equipment Property and Equipment
Property and equipment, stated at cost, at December 31, 2021 and 2020 consisted of the following (in thousands):
20212020
Computers and related equipment$343,101 $317,013 
Furniture and equipment934 2,574 
Leasehold improvements8,287 6,329 
352,322 325,916 
Less: Accumulated depreciation and amortization(191,113)(194,392)
 Total property and equipment, net$161,209 $131,524 

Depreciation and amortization expense was $63.6 million, $60.6 million and $48.0 million for the years ended December 31, 2021, 2020 and 2019, respectively.
Total disposals of long-lived assets for the years ended December 31, 2021, 2020 and 2019 were $11.0 million, $0.9 million and $0.3 million, respectively.