ACQUISITION AND DISCONTINUED OPERATIONS - Schedule of Estimated Fair Values of Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Thousands	Mar. 01, 2019	Mar. 31, 2020	Dec. 31, 2019	Mar. 31, 2019
Business Acquisition [Line Items]
Goodwill		$ 82,104	$ 82,104
Accrued expenses and other liabilities		$ 27,266	$ 26,993
Geminus
Business Acquisition [Line Items]
Investments	$ 4,405
Cash and cash equivalents	755
Restricted cash	2,650
Accrued investment income	32
Service fee receivable	513
Other receivables	12
Property and equipment, net	79
Goodwill	7,445
Other assets	620
Total assets	22,217
Accrued expenses and other liabilities	2,018
Income taxes payable	1
Accrued expenses and other liabilities	10,564
Net deferred income tax liabilities	1,263
Total liabilities	13,846
Purchase price	8,371
Geminus | Customer relationships
Business Acquisition [Line Items]
Intangible asset subject to amortization - customer relationships	3,732			$ 3,700
Geminus | Trade names
Business Acquisition [Line Items]
Intangible assets not subject to amortization - trade names	$ 1,974			$ 2,000