Accounts Payable, Accrued Expenses and Other Liabilities (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2019	Dec. 31, 2018
Accounts Payable [Line Items]
Deferred rent obligations		$ 0	$ 8,242
Business Combination, Contingent Consideration, Liability		30,896	3,070
Equity in RCG Longview partners II, LLC		0	6,367
Interest and Dividends Payable		5,828	2,483
Liability for Unpaid Claims and Claims Adjustment Expense, Incurred but Not Reported (IBNR) Claims, Amount	[1]	30,282	23,714
Accrued Professional Fees		4,789	5,177
Unearned Premiums	[1]	16,092	12,483
Fees Payable		4,628	594
Accrued tax liabilities		2,778	1,742
Software contracts payable		2,884	0
Performance fees payable		3,708	5,959
Accrued expenses and accounts payable	[2]	39,671	40,592
Accounts payable, accrued expenses and other liabilities		141,556	110,423
Hollenfels
Accounts Payable [Line Items]
Accrued Liabilities		$ 13,200	$ 15,700

[1] Balances relate to the Company's reinsurance business entered into during 2016 (See Note 17).

[2] As of December 31, 2019 and 2018, the balance includes reinsurance premiums payable of $13.2 million and $15.7 million, respectively.