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Property and Equipment, net
 6 Months Ended
Jun. 30, 2021
Property, Plant and Equipment [Abstract]  
Property and Equipment, net Property and Equipment, net
The following table presents the detail of property and equipment as of the dates presented (in thousands):
June 30, 2021December 31, 2020
Website development costs$115,198 $95,466 
Leasehold improvements102,204 110,280 
Office equipment, furniture and fixtures34,080 39,607 
Construction-in-progress31,939 44,151 
Computer equipment19,091 20,433 
Property and equipment302,512 309,937 
Less: accumulated amortization and depreciation(112,562)(113,785)
Property and equipment, net$189,950 $196,152 
We recorded depreciation expense related to property and equipment (other than website development costs) of $7.1 million and $7.1 million for the three months ended June 30, 2021 and 2020, respectively, and $15.0 million and $18.9 million for the six months ended June 30, 2021 and 2020, respectively.
We capitalized $14.1 million and $15.4 million in website development costs for the three months ended June 30, 2021 and 2020, respectively, and $26.5 million and $27.9 million for the six months ended June 30, 2021 and 2020, respectively. Amortization expense for website development costs included in cost of revenue was $8.4 million and $6.0 million for the three months ended June 30, 2021 and 2020, respectively, and $16.4 million and $11.4 million for the six months ended June 30, 2021 and 2020, respectively.