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Unconsolidated Affiliates and Noncontrolling Interests (Narrative) (Details) $ in Thousands | 1 Months Ended | 3 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2017 USD ($) entity unitholder shares | Aug. 31, 2017 USD ($) | Jun. 30, 2017 USD ($) unitholder shares | Apr. 30, 2017 USD ($) unitholder shares | Jun. 30, 2017 USD ($) shares | Sep. 30, 2017 USD ($) entity shares | Sep. 30, 2016 USD ($) | Mar. 31, 2017 | Dec. 31, 2016 USD ($) | Mar. 31, 2016
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |
Number of entities - equity method of accounting | entity | 17 |  |  |  |  | 17 |  |  |  |
Proceeds from disposal of investment |  |  |  |  |  | $ 9,000 | $ 0 |  |  |
Third Party Interests |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |
Redeemable interests | $ 13,076 |  |  |  |  | 13,076 |  |  | $ 17,996 |
Noncontrolling interests | 87,939 |  |  |  |  | 87,939 |  |  | 100,035 |
Other Consolidated Subsidiaries |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |
Noncontrolling interests | 10,626 |  |  |  |  | 10,626 |  |  | 12,103 |
Noncontrolling Interests |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |
Noncontrolling interests | 98,565 |  |  |  |  | $ 98,565 |  |  | $ 112,138 |
Payments to noncontrolling interests | $ 63 |  | $ 471 | $ 59 |  |  |  |  |  |
Number of holders in noncontrolling interest (unitholder) | unitholder | 1 |  | 2 | 1 |  |  |  |  |  |
Number of units held by noncontrolling interest (in shares) | shares | 7,084 |  | 59,480 | 6,424 | 59,480 | 7,084 |  |  |  |
River Ridge Mall |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |
Percentage of equity interest in real estate property |  | 25.00% |  |  |  |  |  |  |  |
Proceeds from disposal of investment |  | $ 9,000 |  |  |  |  |  |  |  |
Loss on sale of investment |  | $ 354 |  |  | $ 5,843 |  |  |  |  |
Shoppes at Eagle Point, LLC |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |
Percentage of equity interest in real estate property | 50.00% |  |  |  |  | 50.00% |  |  |  |
Shoppes at Eagle Point, LLC | Corporate Joint Venture |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |
Percentage of equity interest in real estate property |  |  |  |  |  |  |  |  |  | 50.00%
Initial equity contribution | $ 1,031 |  |  |  |  |  |  |  |  |
Shoppes at Eagle Point, LLC | Parent Company |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |
Percentage of equity interest in real estate property |  |  |  |  |  |  |  |  |  | 50.00%
Woodstock GA Investments LLC | Corporate Joint Venture |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |
Percentage of equity interest in real estate property |  |  |  |  |  |  |  | 25.00% |  |
Woodstock GA Investments LLC | Parent Company |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |
Percentage of equity interest in real estate property |  |  |  |  |  |  |  | 75.00% |  |
Foothills Mall |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |
Ownership percentage sold |  |  |  |  | 95.00% |  |  |  |  |

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