Acquisition and Discontinued Operations - Schedule of Estimated Fair Values of Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Thousands	Mar. 01, 2019	Sep. 30, 2019	Mar. 31, 2019	Dec. 31, 2018
Business Acquisition [Line Items]
Goodwill		$ 82,104		$ 74,659
Accrued expenses and other liabilities		$ 19,117		$ 14,786
Geminus
Business Acquisition [Line Items]
Investments	$ 4,405
Investments	755
Restricted cash	2,650
Accrued investment income	32
Service fee receivable	513
Intangible assets not subject to amortization - trade names	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