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
	Mar. 31, 2019	Mar. 31, 2018
Revenues:
Total revenues	$ 27,628	$ 43,894
Expenses:
Interest expense	18	148
Property operating expenses	19,206	20,295
Provision for depreciation	0	6,061
Total expenses	19,224	26,504
Income (loss) from real estate dispositions, net	$ 8,404	$ 17,390