Real Estate Assets, Net - Schedule of ROE Held-For-Sale (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2020 USD ($) property		Mar. 31, 2019 USD ($) property
Real Estate Held For Sale [Roll Forward]
Balance at beginning of period | property	58		102
Balance at beginning of year | $	$ 13,537	[1]	$ 19,402
Transfers from mortgage loans, count | property	5		26
Transfers from mortgage loans | $	$ 814		$ 4,171
Adjustments to record at lower of cost or fair value, count | property	0		0
Adjustments to record at lower of cost or fair value  | $	$ (897)		$ (475)
Disposals, count | property	(19)		(33)
Disposals | $	$ (2,730)		$ (5,028)
Number of properties transferred from held-for-sale to rental | property	0		(1)
Properties transferred from held-for-sale to rental | $	$ 0		$ (293)
Number of properties transferred from rental to held-for-sale | property	1		3
Properties transferred from rental to held-for-sale | $	$ 181		$ 880
Other, count | property	0		0
Other | $	$ 0		$ (77)
Balance at end of year, count | property	45		97
Balance at end of period | $	$ 10,905	[1]	$ 18,580

[1] Property held-for-sale, net, includes valuation allowances of $2.3 million and $1.8 million at March 31, 2020 and December 31, 2019, respectively.