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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, 2020
Dec. 31, 2019
Dec. 31, 2018
Continuing Operations      
Real estate:      
Balances at beginning of year $ 10,372,584 $ 9,707,488 $ 9,460,973
Acquisition of real estate and development and improvements 3,460,556 1,621,739 1,047,312
Sales and/or transfers to assets held for sale (203,687) (852,480) (386,770)
Deconsolidation of real estate 0 0 (325,580)
Impairments (23,991) (19,067) (5,609)
Other (76,569) (85,096) (82,838)
Balances at end of year 13,528,893 10,372,584 9,707,488
Accumulated depreciation:      
Balances at beginning of year 2,141,960 2,054,888 1,912,628
Depreciation expense 438,735 365,319 340,600
Sales and/or transfers to assets held for sale (93,220) (190,877) (82,139)
Real estate held for sale 0 0 (43,525)
Other (78,340) (87,370) (72,676)
Balances at end of year 2,409,135 2,141,960 2,054,888
Discontinued Operations      
Real estate:      
Balances at beginning of year 4,133,349 3,440,706 4,257,599
Acquisition of real estate and development and improvements 119,333 812,827 46,591
Sales and/or transfers to assets held for sale (1,114,792) (245,291) (814,577)
Impairments (198,048) (200,546) (44,120)
Other (9,276) 325,653 (4,787)
Balances at end of year 2,930,566 4,133,349 3,440,706
Accumulated depreciation:      
Balances at beginning of year 861,557 817,931 863,602
Depreciation expense 91,726 122,792 121,064
Sales and/or transfers to assets held for sale (333,654) (68,391) (161,755)
Other (3,921) (10,775) (4,980)
Balances at end of year $ 615,708 $ 861,557 $ 817,931