Business Combinations - Fair Value of Assets and Liabilities Assumed (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019	Oct. 25, 2019	Mar. 29, 2019
Assets:
Real estate, held for sale	$ 46,043	$ 52,883
Liabilities:
Goodwill	$ 11,206	$ 11,206
Owens Realty Mortgage, Inc.
Assets:
Cash and cash equivalents				$ 10,822
Loans				130,449
Real estate, held for sale				67,973
Investment in unconsolidated joint ventures				8,619
Deferred tax assets				4,660
Accrued interest				1,209
Other				379
Total assets acquired				224,111
Liabilities:
Secured borrowings				12,713
Accounts payable and other accrued liabilities				1,000
Due to Manager				228
Deferred tax liabilities				123
Total liabilities assumed				14,064
Net assets acquired				210,047
Gross contractual principal of acquired loan receivables.				$ 134,800
Knight Capital
Assets:
Cash and cash equivalents			$ 1,673
Purchased future receivables,			39,540
Prepaid expenses and other			1,265
Intangible assets			5,880
Total assets acquired			48,358
Liabilities:
Secured borrowings			30,600
Accounts payable and other accrued liabilities			1,173
Total liabilities assumed			31,773
Net assets acquired			16,585
Goodwill			$ 11,205