Schedule III: Real Estate and Accumulated Depreciation - Summary of Activity for Real Estate and Accumulated Depreciation (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Real estate:
Balances at beginning of year	$ 13,052,397	$ 13,473,573	$ 13,974,760
Acquisition of real estate and development and improvements	2,434,566	1,093,903	995,443
Sales and/or transfers to assets held for sale	(933,575)	(1,052,145)	(589,391)
Deconsolidation of real estate	(769,355)	(325,580)	(825,074)
Impairments	(219,613)	(49,729)	(37,274)
Other	240,557	(87,625)	(44,891)
Balances at end of year	13,804,977	13,052,397	13,473,573
Accumulated depreciation:
Balances at beginning of year	2,842,947	2,741,695	2,648,930
Depreciation expense	488,111	461,664	436,085
Sales and/or transfers to assets held for sale	(308,955)	(239,231)	(115,195)
Deconsolidation of real estate	(152,036)	(43,525)	(152,572)
Other	(98,145)	(77,656)	(75,553)
Balances at end of year	$ 2,771,922	$ 2,842,947	$ 2,741,695