Real Estate and Accumulated Depreciation - Schedule III (Changes in Accumulated Depreciation) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Real estate investments, at cost:
Balance at beginning of year	$ 2,345,708	$ 2,211,451	$ 2,296,627
Additions-Acquisitions	147,161	98,364	80,980
Disposals, impairments and reclasses	(168,581)	35,893	(166,156)
Balance at end of the year	2,324,288	2,345,708	2,211,451
Accumulated depreciation:
Balance at beginning of year	328,095	260,399	226,167
Depreciation expense	61,388	63,393	64,731
Disposals, impairments and reclasses	(22,041)	4,303	(30,499)
Balance at end of the year	$ 367,442	$ 328,095	$ 260,399