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Acquisitions - Narrative (Details) - USD ($) $ in Thousands |  |  |  |  |  |  | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | ---
Aug. 19, 2016 | Oct. 30, 2015 | Feb. 17, 2015 | Nov. 14, 2014 | Oct. 31, 2014 | Jun. 04, 2014 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Acquisition |  |  |  |  |  |  |  |  |
Acquisition of properties by assumption of mortgage note payable and other accrued liabilities |  |  |  |  |  |  | $ 0 | $ 0 | $ 1,414,659
Contingent settlement payment |  |  |  |  |  |  | $ 12,180 |  |
PPR Portfolio |  |  |  |  |  |  |  |  |
Acquisition |  |  |  |  |  |  |  |  |
Acquisition of properties by assumption of mortgage note payable and other accrued liabilities |  | $ 713,000 |  |  |  |  |  |  |
Percentage of ownership interest sold |  | 40.00% |  |  |  |  | 40.00% |  |
Cascade Mall |  |  |  |  |  |  |  |  |
Acquisition |  |  |  |  |  |  |  |  |
Additional ownership interest (as a percent) |  |  |  |  |  | 49.00% |  |  |
Purchase price |  |  |  |  |  | $ 15,233 |  |  |
Ownership percentage at completion of acquisition (as a percent) |  |  |  |  |  | 100.00% |  |  |
Fashion Outlets of Chicago | Joint venture |  |  |  |  |  |  |  |  |
Acquisition |  |  |  |  |  |  |  |  |
Purchase price |  |  |  |  | $ 69,987 |  |  |  |
Purchase price funded by cash payment on acquisition |  |  |  |  | 55,867 |  |  |  |
Acquisition of properties by assumption of mortgage note payable and other accrued liabilities |  |  |  |  | $ 14,120 |  |  |  |
Contingent settlement payment | $ 23,800 |  |  |  |  |  |  |  |
PPR Queens Portfolio |  |  |  |  |  |  |  |  |
Acquisition |  |  |  |  |  |  |  |  |
Additional ownership interest (as a percent) |  |  |  | 49.00% |  |  |  |  |
Purchase price |  |  |  | $ 1,838,886 |  |  |  |  |
Ownership percentage at completion of acquisition (as a percent) |  |  |  | 100.00% |  |  |  |  |
Acquisition of properties by assumption of mortgage note payable and other accrued liabilities |  |  |  | $ 672,109 |  |  |  |  |
Issuance restricted common stock |  |  |  | $ 1,166,777 |  |  |  |  |
Inland Center |  |  |  |  |  |  |  |  |
Acquisition |  |  |  |  |  |  |  |  |
Additional ownership interest (as a percent) |  |  | 50.00% |  |  |  |  |  |
Purchase price |  |  | $ 51,250 |  |  |  |  |  |
Ownership percentage at completion of acquisition (as a percent) |  |  | 100.00% |  |  |  |  |  |
Purchase price funded by cash payment on acquisition |  |  | $ 26,250 |  |  |  |  |  |
Acquisition of properties by assumption of mortgage note payable and other accrued liabilities |  |  | $ 25,000 |  |  |  |  |  |

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