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SEGMENT INFORMATION - Schedule of Total Assets, Tangible Property and Equipment, Depreciation and Amortization and Additions to Tangible Long-lived Assets by Segment (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	$ 1,157,881	$ 1,411,507
Property, equipment and software, net	73,581	85,284
Depreciation and amortization of property, equipment and software	63,925	77,792	$ 91,410
Additions to tangible long-lived assets	6,339	4,707	12,894
Operating Segments
Segment Reporting, Asset Reconciling Item [Line Items]
Depreciation and amortization of property, equipment and software	72,819	87,522	105,765
Tangible Property and Equipment
Segment Reporting, Asset Reconciling Item [Line Items]
Property, equipment and software, net	18,809	27,229
North America
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	964,523	971,110
Additions to tangible long-lived assets	1,777	2,000	6,791
North America | Operating Segments
Segment Reporting, Asset Reconciling Item [Line Items]
Depreciation and amortization of property, equipment and software	63,725	78,805	89,083
North America | United States
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	951,800	948,100
North America | Tangible Property and Equipment
Segment Reporting, Asset Reconciling Item [Line Items]
Property, equipment and software, net	10,836	19,427
International
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	193,358	440,397
Additions to tangible long-lived assets	4,562	2,707	6,103
International | Operating Segments
Segment Reporting, Asset Reconciling Item [Line Items]
Depreciation and amortization of property, equipment and software	9,094	8,717	$ 16,682
International | United Kingdom
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	126,000
International | Switzerland
Segment Reporting, Asset Reconciling Item [Line Items]
Assets		151,700
International | Tangible Property and Equipment
Segment Reporting, Asset Reconciling Item [Line Items]
Property, equipment and software, net	$ 7,973	$ 7,802

X

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Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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