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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	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2020
Impaired Long-Lived Assets Held and Used [Line Items]
Total Property, equipment and software, net impairment		$ 15,635
Right-of-use assets - operating leases, net		19,645
Intangible assets, net		103
Other non-current assets		871
Total long-lived assets	$ 13,903	36,254
Restructuring and related charges
Impaired Long-Lived Assets Held and Used [Line Items]
Right-of-use assets - operating leases, net	9,200	9,200
Total long-lived assets	13,903	13,903
Furniture and fixtures
Impaired Long-Lived Assets Held and Used [Line Items]
Total Property, equipment and software, net impairment		413
Leasehold Improvements
Impaired Long-Lived Assets Held and Used [Line Items]
Total Property, equipment and software, net impairment		7,558
Leasehold Improvements | Restructuring and related charges
Impaired Long-Lived Assets Held and Used [Line Items]
Total Property, equipment and software, net impairment	$ 4,800	4,800
Office equipment
Impaired Long-Lived Assets Held and Used [Line Items]
Total Property, equipment and software, net impairment		198
Purchased software
Impaired Long-Lived Assets Held and Used [Line Items]
Total Property, equipment and software, net impairment		14
Computer hardware
Impaired Long-Lived Assets Held and Used [Line Items]
Total Property, equipment and software, net impairment		2,842
Right-of-use assets - finance leases, net
Impaired Long-Lived Assets Held and Used [Line Items]
Total Property, equipment and software, net impairment		1,318
Capitalized software
Impaired Long-Lived Assets Held and Used [Line Items]
Total Property, equipment and software, net impairment		304
Internally-developed software
Impaired Long-Lived Assets Held and Used [Line Items]
Total Property, equipment and software, net impairment		$ 2,988

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Asset Impairment Charges, Excluding Goodwill Impairment

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The amount of impairment loss recognized in the period resulting from the write-down of the carrying amount of an intangible asset (excluding goodwill) to fair value.

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-Publisher FASB
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-Topic 230
-SubTopic 10
-Section 45
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Amount of loss from impairment of right-of-use asset from operating lease.

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-Publisher FASB
-Name Accounting Standards Codification
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