Real Estate Investments and Related Intangibles - Consolidated Joint Ventures Narrative (Details) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2021 USD ($) property joint_venture	Dec. 31, 2020 USD ($) property joint_venture
Schedule of Equity Method Investments [Line Items]
Number of Properties | property	3,855
Total assets	$ 12,977,358	$ 13,355,056
Real estate investments, net	$ 10,662,550	10,770,542
Mortgages [Member]
Schedule of Equity Method Investments [Line Items]
Number of Properties | property	219
Aggregate balance outstanding	$ 1,040,389	$ 1,333,195
Joint ventures [Member]
Schedule of Equity Method Investments [Line Items]
Number of joint ventures | joint_venture	1	1
Total assets	$ 32,600	$ 33,000
Real estate investments, net	$ 28,700	$ 29,100
Joint ventures [Member] | Consolidated Properties [Member]
Schedule of Equity Method Investments [Line Items]
Number of Properties | property	1	1
Joint ventures [Member] | Consolidated Properties [Member] | Mortgages [Member]
Schedule of Equity Method Investments [Line Items]
Aggregate balance outstanding	$ 15,000	$ 14,800