Real Estate Portfolio - Schedule of Components of Direct Financing and Operating Leases (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2019	Dec. 31, 2018
Leases [Abstract]
Income from direct financing and sales-type leases	$ 150,171	$ 822,205	$ 741,564
Income from operating leases	11,529	43,653	47,972
Total leasing revenue	161,700	865,858	789,536
Less: Direct financing lease adjustment	(8,443)	239	(45,404)
Total contractual leasing revenue	$ 153,257	$ 866,097	$ 744,132