Dispositions and Assets Held for Sale - Dispositions and Assets Held for Sale (Details) - Disposal group, disposed of by sale, not discontinued operations - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Revenues:
Total revenues	$ 36,820	$ 133,661	$ 207,918	$ 554,744
Expenses:
Interest expense	584	4,593	6,579	14,801
Property operating expenses	22,485	68,848	117,069	305,598
Provision for depreciation	5,907	23,627	37,254	94,694
Total expenses	28,976	97,068	160,902	415,093
Income (loss) from real estate dispositions, net	$ 7,844	$ 36,593	$ 47,016	$ 139,651