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Noncash Investing and Financing Activities - Summary (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Real Estate Investments, Net [Abstract]
Accrued dividends and distributions payable	$ 2,420	$ 41,656
Additions to real estate assets accrued but not yet paid	26,572	23,318
Conversion of Operating Partnership units for common stock	0	3,059
Lease liabilities arising from obtaining right-of-use assets	4,042	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 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	(566)	(587)
Increase in investment in unconsolidated affiliates	$ 999	$ 974

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SEC Schedule, 12-29, Real Estate Companies, Decrease in Intangible Lease and Other Assets

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The value of the stock converted in a noncash (or part noncash) transaction. Noncash is defined as transactions during a period that do not result in cash receipts or cash payments in the period. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period.

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Carrying value as of the balance sheet date of dividends declared but unpaid on equity securities issued by the entity and outstanding.

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Amount of decrease in investment in mortgage loan on real estate by entity with substantial portion of business acquiring and holding investment real estate or interest in real estate, from foreclosure.

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