Agreements and Transactions with Related Parties - Related Party Income (Details) - Affiliated Entity - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Amounts Included in the Consolidated Statements of Operations
Available Cash Distributions	$ 6,262	$ 5,467	$ 5,078
Personnel and overhead reimbursements	4,170	4,069	3,514
Acquisition fees	0	0	4,415
Interest expense	0	0	332
Accretion of interest on annual distribution and shareholder servicing fee (a)	0	0	198
Related party expenses included operating expenses	21,166	19,936	22,207
Other Transaction Fees Incurred
Watermark commitment agreement	2,850	0	0
Capitalized loan refinancing fees	225	245	280
Selling commissions and dealer manager fees	0	0	13,199
Annual distribution and shareholder servicing fee	0	0	8,439
Capitalized acquisition fees for equity method investment	0	0	6,195
Organization and offering costs	0	0	1,453
Transaction Fees Incurred	3,075	245	29,566
Asset management fees
Amounts Included in the Consolidated Statements of Operations
Operating expenses	$ 10,734	$ 10,400	$ 8,670