Basis of Presentation - Variable Interest Entity Disclosure (Details) - USD ($) $ in Thousands		Mar. 31, 2020	Dec. 31, 2019
Assets
Land, buildings and improvements		$ 10,019,597	$ 9,856,191
Net investments in direct financing leases		844,945	896,549
In-place lease intangible assets and other		2,182,896	2,186,851
Above-market rent intangible assets		897,965	909,139
Accumulated depreciation and amortization		(2,144,252)	(2,035,995)
Assets held for sale, net		0	104,010
Total assets	[1]	13,890,308	14,060,918
Liabilities
Non-recourse mortgages, net		1,433,372	1,462,487
Total liabilities	[1]	7,117,232	7,112,745
Variable Interest Entity
Assets
Land, buildings and improvements		458,092	493,714
Net investments in direct financing leases		15,508	15,584
In-place lease intangible assets and other		48,054	56,915
Above-market rent intangible assets		32,177	34,576
Accumulated depreciation and amortization		(141,408)	(151,017)
Assets held for sale, net		0	104,010
Total assets		425,426	596,168
Liabilities
Non-recourse mortgages, net		24,353	32,622
Total liabilities		$ 70,590	$ 98,671

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