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Investments in Unconsolidated Joint Ventures - Narrative (Details) $ in Thousands |  |  |  |  |  |  |  | 3 Months Ended | 6 Months Ended |
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Apr. 30, 2015 USD ($) | Feb. 17, 2015 USD ($) ft² | Nov. 20, 2014 USD ($) ft² | Nov. 14, 2014 USD ($) ft² mall | Aug. 28, 2014 USD ($) ft² | Jul. 30, 2014 USD ($) ft² | Jun. 04, 2014 USD ($) ft² | Jun. 30, 2015 USD ($) | Jun. 30, 2014 USD ($) | Jun. 30, 2015 USD ($) | Jun. 30, 2014 USD ($) | Nov. 13, 2014 USD ($) ft²
Investments in unconsolidated joint ventures: |  |  |  |  |  |  |  |  |  |  |  |
Gain on remeasurement, sale or write down of assets, net |  |  |  |  |  |  |  | $ 423 | $ (6,268) | $ 423 | $ (6,372) |
The Gallery |  |  |  |  |  |  |  |  |  |  |  |
Investments in unconsolidated joint ventures: |  |  |  |  |  |  |  |  |  |  |  |
Property area (in square feet) | ft² |  |  |  |  |  | 1,376,000 |  |  |  |  |  |
Purchase price |  |  |  |  |  | $ 106,800 |  |  |  |  |  |
Ownership percentage acquired |  |  |  |  |  | 50.00% |  |  |  |  |  |
Candlestick Point |  |  |  |  |  |  |  |  |  |  |  |
Investments in unconsolidated joint ventures: |  |  |  |  |  |  |  |  |  |  |  |
Property area (in square feet) | ft² |  |  |  |  |  |  |  |  |  |  |  | 500,000
Cascade Mall |  |  |  |  |  |  |  |  |  |  |  |
Investments in unconsolidated joint ventures: |  |  |  |  |  |  |  |  |  |  |  |
Property area (in square feet) | ft² |  |  |  |  |  |  | 589,000 |  |  |  |  |
Wilshire Boulevard |  |  |  |  |  |  |  |  |  |  |  |
Investments in unconsolidated joint ventures: |  |  |  |  |  |  |  |  |  |  |  |
Property area (in square feet) | ft² |  |  |  |  | 40,000 |  |  |  |  |  |  |
Proceeds from sale |  |  |  |  | $ 17,100 |  |  |  |  |  |  |
Gain on remeasurement, sale or write down of assets, net |  |  |  |  | 9,033 |  |  |  |  |  |  |
Purchase price funded by cash payment on acquisition |  |  |  |  | 15,386 |  |  |  |  |  |  |
Purchase price paid through assumption of debt by the Company |  |  |  |  | $ 1,714 |  |  |  |  |  |  |
Ownership interest sold (as a percent) |  |  |  |  | 30.00% |  |  |  |  |  |  |
Cascade Mall |  |  |  |  |  |  |  |  |  |  |  |
Investments in unconsolidated joint ventures: |  |  |  |  |  |  |  |  |  |  |  |
Additional ownership interest acquired (as a percent) |  |  |  |  |  |  | 49.00% |  |  |  |  |
Purchase price |  |  |  |  |  |  | $ 15,233 |  |  |  |  |
PPRLP Queens Portfolio |  |  |  |  |  |  |  |  |  |  |  |
Investments in unconsolidated joint ventures: |  |  |  |  |  |  |  |  |  |  |  |
Additional ownership interest acquired (as a percent) |  |  |  | 49.00% |  |  |  |  |  |  |  |
Purchase price |  |  |  | $ 1,838,886 |  |  |  |  |  |  |  |
Number of regional shopping centers owned by investee | mall |  |  |  | 5 |  |  |  |  |  |  |  |
Common stock issued (in shares) |  |  |  | $ 1,166,777 |  |  |  |  |  |  |  |
Purchase price paid through assumption of debt by the Company |  |  |  | $ 672,109 |  |  |  |  |  |  |  |
PPRLP Queens Portfolio | Lakewood Center |  |  |  |  |  |  |  |  |  |  |  |
Investments in unconsolidated joint ventures: |  |  |  |  |  |  |  |  |  |  |  |
Property area (in square feet) | ft² |  |  |  | 2,075,000 |  |  |  |  |  |  |  |
PPRLP Queens Portfolio | Los Cerritos Center |  |  |  |  |  |  |  |  |  |  |  |
Investments in unconsolidated joint ventures: |  |  |  |  |  |  |  |  |  |  |  |
Property area (in square feet) | ft² |  |  |  | 1,287,000 |  |  |  |  |  |  |  |
PPRLP Queens Portfolio | Queens Center |  |  |  |  |  |  |  |  |  |  |  |
Investments in unconsolidated joint ventures: |  |  |  |  |  |  |  |  |  |  |  |
Property area (in square feet) | ft² |  |  |  | 966,000 |  |  |  |  |  |  |  |
PPRLP Queens Portfolio | Stonewood Center |  |  |  |  |  |  |  |  |  |  |  |
Investments in unconsolidated joint ventures: |  |  |  |  |  |  |  |  |  |  |  |
Property area (in square feet) | ft² |  |  |  | 932,000 |  |  |  |  |  |  |  |
PPRLP Queens Portfolio | Washington Square |  |  |  |  |  |  |  |  |  |  |  |
Investments in unconsolidated joint ventures: |  |  |  |  |  |  |  |  |  |  |  |
Property area (in square feet) | ft² |  |  |  | 1,444,000 |  |  |  |  |  |  |  |
443 Wabash MAB LLC |  |  |  |  |  |  |  |  |  |  |  |
Investments in unconsolidated joint ventures: |  |  |  |  |  |  |  |  |  |  |  |
Property area (in square feet) | ft² |  |  | 65,000 |  |  |  |  |  |  |  |  |
Purchase price |  |  | $ 18,900 |  |  |  |  |  |  |  |  |
Ownership percentage acquired |  |  | 45.00% |  |  |  |  |  |  |  |  |
Inland Center |  |  |  |  |  |  |  |  |  |  |  |
Investments in unconsolidated joint ventures: |  |  |  |  |  |  |  |  |  |  |  |
Additional ownership interest acquired (as a percent) |  | 50.00% |  |  |  |  |  |  |  |  |  |
Property area (in square feet) | ft² |  | 933,000 |  |  |  |  |  |  |  |  |  |
Purchase price |  | $ 51,250 |  |  |  |  |  |  |  |  |  |
Purchase price funded by cash payment on acquisition |  | 26,250 |  |  |  |  |  |  |  |  |  |
Purchase price paid through assumption of debt by the Company |  | 25,000 |  |  |  |  |  |  |  |  |  |
Debt repaid |  | $ 50,000 |  |  |  |  |  |  |  |  |  |
Sears Locations |  |  |  |  |  |  |  |  |  |  |  |
Investments in unconsolidated joint ventures: |  |  |  |  |  |  |  |  |  |  |  |
Purchase price | $ 150,000 |  |  |  |  |  |  |  |  |  |  |
Ownership percentage acquired | 50.00% |  |  |  |  |  |  |  |  |  |  |
Notes Receivable | Candlestick Point |  |  |  |  |  |  |  |  |  |  |  |
Investments in unconsolidated joint ventures: |  |  |  |  |  |  |  |  |  |  |  |
Note receivable |  |  |  |  |  |  |  |  |  |  |  | $ 65,130
Description of variable rate basis |  |  |  |  |  |  |  |  |  | LIBOR |  |
London Interbank Offered Rate (LIBOR) | Notes Receivable | Candlestick Point |  |  |  |  |  |  |  |  |  |  |  |
Investments in unconsolidated joint ventures: |  |  |  |  |  |  |  |  |  |  |  |
Basis spread (as a percent) |  |  |  |  |  |  |  |  |  |  |  | 2.00%

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