Schedule III - Real Estate and Accumulated Depreciation - Changes in Accumulated Depreciation (Details) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Balance, beginning of period	$ 2,500,052,642	$ 2,385,287,743	$ 2,433,052,747
Depreciation for year	265,143,630	260,533,557	293,667,298
Sales and assets held-for-sale	(3,041,189)	(88,079,838)	(256,804,957)
Transfers to operating lease right-of-use assets, net	0	(1,342,030)	0
Transfers to unconsolidated joint ventures	0	0	(11,634,554)
Adjustment for fully depreciated assets/other	(45,041,556)	(56,346,790)	(72,992,791)
Balance, end of period	$ 2,717,113,527	$ 2,500,052,642	$ 2,385,287,743