Summary of Significant Accounting Policies - Schedule of Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Fair Value
Fair Value of Financial Instruments [Line Items]
Notes receivable from Preferred and Common Operating Partnership unit holders	$ 116,184	$ 115,467
Fixed rate notes payable and notes payable to trusts	3,511,151	2,985,731
Exchangeable senior notes	673,831	620,149
Carrying Value
Fair Value of Financial Instruments [Line Items]
Notes receivable from Preferred and Common Operating Partnership unit holders	118,524	119,735
Fixed rate notes payable and notes payable to trusts	3,417,928	3,022,414
Exchangeable senior notes	$ 575,000	$ 575,000