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Noncash Investing and Financing Activities - Summary (Details) - USD ($) $ in Thousands | 6 Months Ended
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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

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