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GOODWILL AND LONG-LIVED ASSETS - Impairment for Long-lived Assets and Restructuring and Related Charges by Asset Type (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Impaired Long-Lived Assets Held and Used [Line Items]        
Finance Lease, Impairment Loss $ 0 $ 70 $ 0 $ 1,388
Total Property, equipment and software, net 870 261 870 15,896
Right-of-use assets - operating leases, net 6,781 3,035 6,781 22,680
Intangible assets, net 0 0 0 103
Other non-current assets 0 0 0 871
Total long-lived assets 7,651 3,296 7,651 39,550
Restructuring and related charges:        
Impaired Long-Lived Assets Held and Used [Line Items]        
Total long-lived assets 7,651 3,296 7,651 17,199
Leasehold Improvements        
Impaired Long-Lived Assets Held and Used [Line Items]        
Property, equipment and software, impairment 870 191 870 7,749
Computer hardware        
Impaired Long-Lived Assets Held and Used [Line Items]        
Property, equipment and software, impairment 0 0 0 2,842
Internally-developed software        
Impaired Long-Lived Assets Held and Used [Line Items]        
Property, equipment and software, impairment 0 0 0 2,988
Other Property, equipment and software, net        
Impaired Long-Lived Assets Held and Used [Line Items]        
Property, equipment and software, impairment $ 0 $ 0 $ 0 $ 929