Basis of Presentation - Variable Interest Entity Disclosure (Details) - USD ($) $ in Thousands		Jun. 30, 2020	Dec. 31, 2019
Assets
Land, buildings and improvements		$ 10,287,575	$ 9,856,191
Net investments in direct financing leases		752,630	896,549
In-place lease intangible assets and other		2,197,714	2,186,851
Above-market rent intangible assets		896,051	909,139
Accumulated depreciation and amortization		(2,257,551)	(2,035,995)
Assets held for sale, net		0	104,010
Total assets	[1]	13,956,013	14,060,918
Liabilities
Non-recourse mortgages, net		1,424,195	1,462,487
Total liabilities	[1]	7,153,558	7,112,745
Variable Interest Entity
Assets
Land, buildings and improvements		477,000	493,714
Net investments in direct financing leases		15,421	15,584
In-place lease intangible assets and other		52,510	56,915
Above-market rent intangible assets		33,370	34,576
Accumulated depreciation and amortization		(131,612)	(151,017)
Assets held for sale, net		0	104,010
Total assets		459,641	596,168
Liabilities
Non-recourse mortgages, net		6,122	32,622
Total liabilities		$ 52,522	$ 98,671

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