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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables)
 12 Months Ended
Dec. 31, 2020
Accounting Policies [Abstract]  
Schedule of Property and Equipment and Depreciation Expense
We recognized the following depreciation expense (in thousands): 
2020$42,890 
201945,016 
201845,155 
A summary of our property and equipment as of December 31, is as follows (in thousands): 
20202019
Furniture, fixtures, and equipment$286,277 $283,378 
Buildings93,538 112,410 
Corporate aircraft11,461 11,461 
Leasehold improvements67,037 61,539 
Land19,816 20,146 
Construction in progress853 1,042 
Less: accumulated depreciation and amortization(300,033)(281,553)
Net property and equipment$178,949 $208,423 
Schedule of Amortization Expense of Software We recognized the following amortization expense of purchased and internally developed software (in thousands): 
2020$22,612 
201917,023 
201814,688 
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): 
20202019
Purchased software$29,029 $34,026 
Internally developed software127,476 100,894 
Less accumulated amortization(96,891)(83,158)
Net software$59,614 $51,762