Schedule III - Real Estate and Accumulated Depreciation - Changes in Accumulated Depreciation (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward]
Balance, beginning of year	$ 2,622,879	$ 2,217,108	$ 1,766,006
Additions:
Depreciation expense	352,531	497,511	548,901
Deductions/Other:
Dispositions	(201,319)	(57,346)	(34,086)
Impairments	(34,847)	(32,147)	(50,828)
Reclassified to assets held for sale	(7,602)	(400)	(12,885)
Other	(4,543)	(1,847)	0
Balance, end of year	$ 2,727,099	$ 2,622,879	$ 2,217,108