SEC Schedule III Rollforward of Real Estate Assets and Accumulated Depreciation (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Real estate, balance at beginning of period	$ 12,087,943	$ 13,074,012	$ 16,237,883
Additions during the period	13,571,474	14,202,977	17,675,741
Less: Assets sold, written-off and deconsolidated	353,629	2,115,034	4,601,729
Real estate, balance at end of period	13,217,845	12,087,943	13,074,012
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward]
Accumulated depreciation, balance at beginning of period	3,169,446	3,015,958	3,180,175
Additions charged to operating expenses	362,311	344,301	360,194
Real estate accumulated depreciation	3,531,757	3,360,259	3,540,369
Less: Accumulated depreciation on assets sold, written-off and deconsolidated	155,410	190,813	524,411
Accumulated depreciation, balance at end of period	3,376,347	3,169,446	3,015,958
Land
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Additions during the period	197,057	1,372	46,074
Buildings & improvements
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Additions during the period	$ 1,286,474	$ 1,127,593	$ 1,391,784