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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 consists of the following (dollars in thousands):
December 31,
Useful Lives20212020
Computer hardware and software
2-10 years
$1,101,248 $974,490 
Leasehold improvements
1-15 years
622,771 554,252 
Furniture and equipment
1-10 years
260,551 243,880 
Construction in progressN/A120,031 117,274 
Total cost2,104,601 1,889,896 
Accumulated depreciation and amortization1,288,509 1,074,887 
Property and equipment, net$816,092 $815,009 
Depreciation and amortization expense associated with property and equipment was $244.9 million, $268.3 million and $207.8 million for the years ended December 31, 2021, 2020 and 2019, respectively. During the year ended December 31, 2020, we recorded $29.2 million in asset impairment charges related to property and equipment (see Note 7). There were no asset impairment charges related to property and equipment during the year ended December 31, 2021.
Construction in progress includes capitalizable costs incurred during the development stage of computer software and leasehold improvements that have not yet been placed in service.