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Dispositions (Details) ft² in Thousands, $ in Thousands |  |  |  |  |  |  |  |  | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Nov. 16, 2017 USD ($) ft² | Jan. 18, 2017 USD ($) ft² | Jul. 15, 2016 USD ($) ft² | May 31, 2016 USD ($) | Apr. 13, 2016 USD ($) ft² | Nov. 19, 2015 USD ($) ft² | Oct. 23, 2015 USD ($) | Jun. 30, 2015 USD ($) ft² | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on extinguishment of debt |  |  |  |  |  |  | $ (578) |  | $ 0 | $ 1,709 | $ 1,487
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 |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |
Cascade Mall |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |
Property square footage | ft² |  | 589 |  |  |  |  |  |  |  |  |
Northgate Mall |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |
Property square footage | ft² |  | 750 |  |  |  |  |  |  |  |  |
Cascade and Northgate Malls |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale |  | $ 170,000 |  |  |  |  |  |  |  |  |
Gain (loss) on disposal |  | $ 59,577 |  |  |  |  |  |  |  |  |
500 North Michigan Avenue |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |
Property square footage | ft² | 326 |  |  |  |  |  |  |  |  |  |
Proceeds from sale | $ 86,350 |  |  |  |  |  |  |  |  |  |
Gain (loss) on disposal | $ 14,597 |  |  |  |  |  |  |  |  |  |

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