Basis of Presentation - Variable Interest Entity Disclosure (Details) - USD ($) $ in Thousands		Jun. 30, 2021	Dec. 31, 2020
Assets
Land, buildings and improvements		$ 11,621,204	$ 10,939,619
Net investments in direct financing leases		657,360	711,974
In-place lease intangible assets and other		2,405,433	2,301,174
Above-market rent intangible assets		868,970	881,159
Accumulated depreciation and amortization		(2,699,085)	(2,490,087)
Total assets	[1]	15,232,166	14,707,636
Liabilities
Non-recourse mortgages, net		724,778	1,145,554
Below-market rent and other intangible liabilities, net		197,067	197,248
Total liabilities	[1]	7,931,399	7,829,267
Variable Interest Entity
Assets
Land, buildings and improvements		423,333	423,333
Net investments in direct financing leases		15,044	15,242
In-place lease intangible assets and other		41,978	41,997
Above-market rent intangible assets		26,720	26,720
Accumulated depreciation and amortization		(146,120)	(137,827)
Total assets		373,709	381,953
Liabilities
Non-recourse mortgages, net		1,683	3,508
Below-market rent and other intangible liabilities, net		21,426	22,283
Total liabilities		$ 46,770	$ 48,971

[1] See Note 2 for details related to variable interest entities (“VIEs”).