Investments in and Advances to Unconsolidated Affiliates - Unconsolidated Affiliates - Schedule of Condensed Balance Sheet (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Combined and Condensed Balance Sheets
Real estate under development	$ 247,349	$ 253,402
Other assets	173,809	190,658
Total assets	4,186,882	4,309,114	$ 3,958,780
Total liabilities and equity	4,186,882	4,309,114
Cost method investments	1,881	1,932
Company's share of distributions in excess of income from and investments in unconsolidated affiliates	15,616	15,362
Investments in and advances to unconsolidated affiliates	249,807	305,097
Unconsolidated Affiliates
Combined and Condensed Balance Sheets
Rental property, net	563,997	656,265
Real estate under development	14,517	1,341
Other assets	61,969	85,540
Total assets	640,483	743,146
Mortgage notes payable	512,490	502,036
Other liabilities	74,872	77,785
Partners’ equity	53,121	163,325
Total liabilities and equity	640,483	743,146
Company's share of accumulated equity	100,767	186,864
Basis differential	55,017	100,962
Deferred fees, net of portion related to the Company's interest	3,565	1,270
Amounts receivable/payable by the Company	363	(1,902)
Investments in and advances to unconsolidated affiliates, net of Company's share of distributions in excess of income from and investments in unconsolidated affiliates	159,712	287,194
Cost method investments	74,479	2,541
Company's share of distributions in excess of income from and investments in unconsolidated affiliates	15,616	15,362
Investments in and advances to unconsolidated affiliates	$ 249,807	$ 305,097