Noncontrolling Interests - Variable Interest Entities (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Variable interest entity
Net real estate	$ 19,777,780	$ 17,466,152
Total assets	23,711,094	20,740,285
Total liabilities	10,341,981	9,722,555
Primary Beneficiary
Variable interest entity
Net real estate	658,425	635,963
Total assets	744,403	723,668
Total liabilities	$ 53,665	$ 47,962