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Dispositions (Details) ft² in Thousands, $ in Thousands |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 12 Months Ended
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Jul. 15, 2016 USD ($) ft² | May 31, 2016 USD ($) | Apr. 13, 2016 USD ($) ft² | Nov. 19, 2015 USD ($) ft² | Jun. 30, 2015 USD ($) ft² | Dec. 29, 2014 USD ($) ft² | Oct. 31, 2014 USD ($) ft² | Oct. 10, 2014 USD ($) | Sep. 11, 2014 USD ($) | Aug. 28, 2014 USD ($) | Jul. 07, 2014 USD ($) | Mar. 17, 2014 USD ($) ft² note | Feb. 14, 2014 USD ($) ft² | Jan. 15, 2014 USD ($) ft² | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on extinguishment of debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 13,737 | $ 16,066 | $ (526)
Flagstaff Mall |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on extinguishment of debt | $ 5,284 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Rotterdam Square |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property square footage | ft² |  |  |  |  |  |  |  |  |  |  |  |  |  | 585 |  |  |
Proceeds from sale |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 8,500 |  |  |
Gain (loss) on disposal |  |  |  |  |  |  |  |  |  |  |  |  |  | $ (472) |  |  |
Somersville Town Center |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property square footage | ft² |  |  |  |  |  |  |  |  |  |  |  |  | 348 |  |  |  |
Proceeds from sale |  |  |  |  |  |  |  |  |  |  |  |  | $ 12,337 |  |  |  |
Gain (loss) on disposal |  |  |  |  |  |  |  |  |  |  |  |  | $ (263) |  |  |  |
Lake Square Mall |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property square footage | ft² |  |  |  |  |  |  |  |  |  |  |  | 559 |  |  |  |  |
Proceeds from sale |  |  |  |  |  |  |  |  |  |  |  | $ 13,280 |  |  |  |  |
Gain (loss) on disposal |  |  |  |  |  |  |  |  |  |  |  | (876) |  |  |  |  |
Cash payment |  |  |  |  |  |  |  |  |  |  |  | $ 3,677 |  |  |  |  |
Lake Square Mall | Notes receivable |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of notes receivable | note |  |  |  |  |  |  |  |  |  |  |  | 2 |  |  |  |  |
Notes receivable |  |  |  |  |  |  |  |  |  |  |  | $ 9,603 |  |  |  |  |
Mervyn's |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale |  |  |  |  |  |  |  | $ 1,900 | $ 1,200 | $ 3,500 | $ 3,560 |  |  |  |  |  |
Gain (loss) on disposal |  |  |  |  |  |  |  | $ (3) | $ 315 | $ (80) | $ (158) |  |  |  |  |  |
South Towne Center |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property square footage | ft² |  |  |  |  |  |  | 1,278 |  |  |  |  |  |  |  |  |  |
Proceeds from sale |  |  |  |  |  |  | $ 205,000 |  |  |  |  |  |  |  |  |  |
Gain (loss) on disposal |  |  |  |  |  |  | $ 121,873 |  |  |  |  |  |  |  |  |  |
Camelback Colonnade |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale |  |  |  |  |  | $ 92,898 |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on disposal |  |  |  |  |  | 24,554 |  |  |  |  |  |  |  |  |  |  |
Cash payment |  |  |  |  |  | 61,173 |  |  |  |  |  |  |  |  |  |  |
Assumption of debt |  |  |  |  |  | 31,725 |  |  |  |  |  |  |  |  |  |  |
Debt discharged |  |  |  |  |  | 47,946 |  |  |  |  |  |  |  |  |  |  |
Noncontrollling interest adjustment |  |  |  |  |  | $ 17,217 |  |  |  |  |  |  |  |  |  |  |
Camelback Colonnade | Joint venture |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property square footage | ft² |  |  |  |  |  | 619 |  |  |  |  |  |  |  |  |  |  |
Ownership interest (as a percent) |  |  |  |  |  | 67.50% |  |  |  |  |  |  |  |  |  |  |
Great Northern Mall |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property square footage | ft² |  |  |  |  | 895 |  |  |  |  |  |  |  |  |  |  |  |
Great Northern Mall | Great Northern Mall |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on extinguishment of debt |  |  |  |  | $ (1,627) |  |  |  |  |  |  |  |  |  |  |  |
Panorama Mall |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property square footage | ft² |  |  |  | 312 |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale |  |  |  | $ 98,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on disposal |  |  |  | $ 73,726 |  |  |  |  |  |  |  |  |  |  |  |  |
Capitola Mall |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property square footage | ft² |  |  | 586 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale |  |  | $ 93,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on disposal |  |  | $ 24,894 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mervyn's (former locations) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale |  | $ 3,200 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on disposal |  | $ (3,066) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Flagstaff Mall |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property square footage | ft² | 347 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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