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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables)
 12 Months Ended
Dec. 31, 2021
Accounting Policies [Abstract]  
Schedule of Property and Equipment and Depreciation Expense
We recognized the following depreciation expense (in thousands): 
2021$39,790 
202042,890 
201945,016 
A summary of our property and equipment as of December 31, is as follows (in thousands): 
20212020
Furniture, fixtures, and equipment$292,224 $286,277 
Buildings (1)
60,059 93,538 
Corporate aircraft (1)
— 11,461 
Leasehold improvements70,630 67,037 
Land11,014 19,816 
Construction in progress8,185 853 
Less: accumulated depreciation and amortization(302,281)(300,033)
Net property and equipment$139,831 $178,949 
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(1) Our corporate aircraft and an office building in Kansas City, Missouri, have been reclassified as held-for-sale assets as of December 31, 2021. Held-for-sale assets of $35.0 million are expected to sell in the first half of 2022 and are included within Prepaid expenses and other current assets in our Consolidated Balance Sheet as of December 31, 2021. The estimated fair value of the assets that are held for sale is $64.0 million.
Schedule of Amortization Expense of Software We recognized the following amortization expense of purchased and internally developed software (in thousands): 
2021$25,975 
202022,612 
201917,023 
Schedule of Purchased and Internally Developed Software
A summary of our purchased and internally developed software as of December 31, is as follows (in thousands): 
20212020
Purchased software$30,312 $29,029 
Internally developed software153,983 127,476 
Less accumulated amortization(114,183)(96,891)
Net software$70,112 $59,614