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Schedule III - Real Estate and Accumulated Depreciation (Changes in Total Real Estate Assets and Accumulated Depreciation) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Schedule III - Real Estate and Accumulated Depreciation [Abstract]      
Balance, beginning of period $ 9,115,793 $ 8,328,475 $ 7,667,743
Acquisition of operating properties and unconsolidated joint ventures 0 422,309 286,901
Development and repositions 349,890 341,236 300,294
Improvements 87,865 75,360 84,841
Cost of real estate sold – other (371) (51,587) (11,304)
Balance, end of period 9,553,177 9,115,793 8,328,475
Balance, Beginning of period 2,686,025 2,403,149 2,118,839
Depreciation of real estate assets 348,161 317,026 284,310
Dispositions 0 (34,150) 0
Balance, End of period 3,034,186 $ 2,686,025 $ 2,403,149
Real Estate, Federal Income Tax Basis $ 8,600,000