Schedule III - Real Estate and Accumulated Depreciation - Summary of Changes in Accumulated Depreciation (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Changes in accumulated depreciation
Balance, beginning of year	$ 7,276,786	$ 6,696,281	$ 6,040,378
Depreciation	820,832	831,083	785,725
Dispositions and other	(237,961)	(250,578)	(129,822)
Balance, end of year	$ 7,859,657	$ 7,276,786	$ 6,696,281