Noncash Investing and Financing Activities - Summary (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2019	Sep. 30, 2018
Real Estate Investments, Net [Abstract]
Accrued dividends and distributions payable	$ 2,420	$ 2,420	$ 41,657
Additions to real estate assets accrued but not yet paid		23,148	22,428
Conversion of Operating Partnership units for common stock		0	3,059
Lease liabilities arising from obtaining right-of-use assets		3,975	0
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation Disclosure [Abstract]
Decrease in real estate assets		(60,059)	0
Decrease in mortgage and other indebtedness		124,111	0
Decrease in noncontrolling interest and joint venture interest	$ 4,270
Decrease in operating assets and liabilities		9,333	0
Decrease in intangible lease and other assets		(1,663)	0
Corporate Joint Venture
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation Disclosure [Abstract]
Decrease in real estate assets		(93,360)	(587)
Increase in investment in unconsolidated affiliates		17,903	974
Decrease in mortgage and other indebtedness		73,283	0
Decrease in operating assets and liabilities		2,443	0
Decrease in intangible lease and other assets		(908)	0
Decrease in noncontrolling interest and joint venture interest		$ 4,271	$ 0