Schedule III - REAL ESTATE AND ACCUMULATED DEPRECIATION (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Real Estate:
Balance at beginning of the year	$ 6,074,516	$ 5,943,970	$ 5,895,953
Acquisitions	202,565	65,270	164,320
Additions	165,930	252,306	469,450
Assets sold or writtenoff	(92,332)	(152,000)	(585,753)
Real estate impaired	(40,318)	(35,030)
Balance at end of the year	6,310,361	6,074,516	5,943,970
Accumulated Depreciation:
Balance at beginning of the year	1,232,699	1,119,612	1,086,844
Depreciation expense	201,649	194,190	161,937
Accumulated depreciation on assets sold or writtenoff	(51,162)	(53,878)	(129,169)
Accumulated depreciation on real estate impaired	(15,174)	(27,225)
Balance at end of the year	1,368,012	1,232,699	$ 1,119,612
Impairment loss	$ 25,144	10,232
Impairment of real estate		7,800
Impairment of right-of-use asset from operating lease		$ 2,400