Investments in and Advances to Unconsolidated Real Estate Ventures - Condensed Combined Financial Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Jan. 01, 2019
Equity Method Investment, Summarized Financial Information, Assets, Operating Leases, Right of Use Assets				$ 52,400
Operating Lease, Liability				$ 44,100
Combined balance sheet information:
Real estate, net	$ 2,493,961	$ 2,050,985
Other assets, net	291,092	169,264
Total assets	2,785,053	2,220,249
Borrowings, net	1,187,856	1,125,368
Other liabilities, net	168,243	94,845
Total liabilities	1,356,099	1,220,213
Total equity	1,428,954	1,000,036
Total liabilities and equity	2,785,053	2,220,249
Combined income statement information:
Total revenue	266,653	300,032	$ 135,256
Operating income	18,041	56,262	14,741
Net loss	$ (32,507)	$ (1,155)	$ (7,593)