Schedule III - Real Estate and Accumulated Depreciation - Reconciliation of Real Estate - Owned Subject to Operating Leases (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance	$ 3,156,552	$ 3,131,841	$ 3,160,472
Property improvements during the year	48,570	38,913	37,985
Properties acquired during the year	136,105	0	11,601
Properties sold during the year	(61,491)	0	(69,056)
Assets written off during the year	(13,581)	(14,202)	(9,161)
Balance	$ 3,266,155	$ 3,156,552	$ 3,131,841