Noncash Investing and Financing Activities - Summary (Details) - USD ($) $ in Thousands	6 Months Ended
Jun. 30, 2018	Jun. 30, 2017
Real Estate Investments, Net [Abstract]
Accrued dividends and distributions payable	$ 41,656	$ 54,376
Additions to real estate assets accrued but not yet paid	23,318	15,842
Note receivable from sale of outparcel	0	1,802
Conversion of Operating Partnership units for common stock	3,059	0
Deconsolidation upon contribution/assignment of interests in joint venture:
Decrease in noncontrolling interest and joint venture interest		2,232
Outlet Shoppes at Atlanta - Ridgewalk
Deconsolidation upon contribution/assignment of interests in joint venture:
Decrease in real estate assets	0	(139,623)
Decrease in mortgage and other indebtedness	0	171,953
Transfer of real estate assets in settlement of mortgage debt obligation:
Decrease in real estate assets	0	(139,623)
Decrease in mortgage and other indebtedness	0	171,953
Decrease in operating assets and liabilities	0	645
Corporate Joint Venture
Deconsolidation upon contribution/assignment of interests in joint venture:
Decrease in real estate assets	(587)	(9,131)
Increase in investment in unconsolidated affiliates	974	0
Decrease in mortgage and other indebtedness	0	2,466
Decrease in operating assets and liabilities	0	1,286
Decrease in noncontrolling interest and joint venture interest	0	2,232
Transfer of real estate assets in settlement of mortgage debt obligation:
Decrease in real estate assets	(587)	(9,131)
Decrease in mortgage and other indebtedness	$ 0	$ 2,466

Future cash outflow to pay for real estate additions accrued but not yet paid.

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Increase (Decrease) in Operating Assets and Liabilities

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Note Receivable from Sale of Real Estate

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Settlement of Mortgage Debt Obligation, Noncash, Increase (Decrease) in Operating Assets and Liabilities

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Unconsolidated Affiliates, Increase (Decrease) from Deconsolidation

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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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The amount of the reduction or elimination during the period of a noncontrolling interest resulting from the parent's loss of control and deconsolidation of the entity in which one or more outside parties had a noncontrolling interest.

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Amount of increase (decrease) before accumulated depreciation of real estate investments for entities with a substantial portion of business acquiring and holding investment real estate.

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