Noncontrolling Interests - Variable Interest Entities (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Variable interest entity
Net real estate	$ 18,900,314	$ 17,466,152
Total assets	21,984,941	20,740,285
Total liabilities	10,111,262	9,722,555
Primary Beneficiary
Variable interest entity
Net real estate	651,920	635,963
Total assets	737,071	723,668
Total liabilities	$ 50,300	$ 47,962