Consolidated Variable Interest Entities, Schedule of Variable Interest Entities (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019	Jun. 30, 2019
Variable Interest Entity [Line Items]
Investment property, net	$ 7,288,401	$ 7,232,620
Other assets, net (including $23,751 and $23,894 for consolidated VIEs at March 31, 2020 and December 31, 2019; see Note 7)	219,176	219,896
Mortgage loans payable (including $46,727 and $46,993 for consolidated VIEs at March 31, 2020 and December 31, 2019; see Note 7)	3,273,808	3,180,592
Other liabilities (including $19,604 and $13,631 for consolidated VIEs at March 31, 2020 and December 31, 2019; see Note 7)	82,341	81,289
Liabilities	4,346,127	3,848,104
Consolidated VIEs	$ 9,374	$ 8,542
VIE as a Percentage of Consolidated Assets	4.60%	4.70%
VIE as a Percentage of Consolidated Liabilities	2.30%	2.50%
VIE as a Percentage of Total Equity	1.00%
Variable Interest Entity, Primary Beneficiary [Member]
Variable Interest Entity [Line Items]
Investment property, net	$ 350,019	$ 344,300
Other assets, net (including $23,751 and $23,894 for consolidated VIEs at March 31, 2020 and December 31, 2019; see Note 7)	23,751	23,894
Total Assets	373,770	368,194
Mortgage loans payable (including $46,727 and $46,993 for consolidated VIEs at March 31, 2020 and December 31, 2019; see Note 7)	46,727	46,993
Preferred OP units - mandatorily redeemable	35,249	35,249	$ 35,249
Other liabilities (including $19,604 and $13,631 for consolidated VIEs at March 31, 2020 and December 31, 2019; see Note 7)	19,604	13,631
Liabilities	101,580	95,873
Equity Interests	26,063	27,091
Consolidated VIEs	9,374	8,542
Total Liabilities and Stockholder's Equity	$ 137,017	$ 131,506