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Dispositions: (Details) ft² in Thousands, $ in Thousands |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 Months Ended | 12 Months Ended |  |
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Nov. 19, 2015 USD ($) ft² | Jun. 30, 2015 USD ($) ft² | Dec. 29, 2014 USD ($) | Oct. 31, 2014 USD ($) 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 ($) ft² | Dec. 11, 2013 USD ($) ft² | Dec. 04, 2013 USD ($) | Oct. 23, 2013 USD ($) | Oct. 15, 2013 USD ($) | Sep. 30, 2013 USD ($) | Sep. 11, 2013 USD ($) | Jun. 04, 2013 USD ($) ft² | May. 31, 2013 USD ($) ft² | Dec. 31, 2014 USD ($) | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($) | Dec. 31, 2013 USD ($) | Sep. 17, 2013 ft² | Dec. 31, 2012 ft²
Discontinued Operations: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on disposal |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 151,467 |  |  |  |  |
Gain (loss) on extinguishment of debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 16,066 | $ (526) | $ 1,432 |  |
Revenues from discontinued operations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 54,752 |  |
Gain (loss) income from discontinued operations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | $ 0 | $ 289,936 |  |
Camelback Colonnade |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Discontinued Operations: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale |  |  | $ 92,898 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on disposal |  |  | $ 24,554 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest (as a percent) |  |  | 67.50% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property square footage | ft² |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 619 |
Cash payment |  |  | $ 61,173 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assumption of debt |  |  | 31,725 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt discharged |  |  | 47,946 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Noncontrollling interest adjustment |  |  | $ 17,217 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fiesta Mall |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Discontinued Operations: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property square footage | ft² |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 933
Gain (loss) on extinguishment of debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,252 |  |  |  |  |  |  |  |  |
Green Tree Mall |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Discontinued Operations: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 79,000 |  |  |  |  |  |
Gain (loss) on disposal |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 59,767 |  |  |  |  |  |
Property square footage | ft² |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 793 |  |  |  |  |  |
Northridge Mall |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Discontinued Operations: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property square footage | ft² |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 890 |  |  |  |  |  |  |
Rimrock Mall |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Discontinued Operations: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property square footage | ft² |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 603 |  |  |  |  |  |  |
Rimrock Mall and Nortridge Mall |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Discontinued Operations: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 230,000 |  |  |  |  |  |  |
Gain (loss) on disposal |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 82,151 |  |  |  |  |  |  |
Mervyn's |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Discontinued Operations: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale |  |  |  |  | $ 1,900 | $ 1,200 | $ 3,500 | $ 3,560 |  |  |  |  | $ 10,475 | $ 5,430 | $ 5,700 |  | $ 12,000 |  |  |  |  |  |  |  |
Gain (loss) on disposal |  |  |  |  | $ (3) | $ 315 | $ (80) | $ (158) |  |  |  |  | $ (5,257) | $ 1,695 | $ (2,031) |  | $ (2,633) |  |  |  |  |  |  |  |
Chesterfield Towne Center |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Discontinued Operations: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property square footage | ft² |  |  |  |  |  |  |  |  |  |  |  | 1,016 |  |  |  |  |  |  |  |  |  |  |  |  |
Assumption of debt |  |  |  |  |  |  |  |  |  |  |  | $ 109,737 |  |  |  |  |  |  |  |  |  |  |  |  |
Centre at Salisbury |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Discontinued Operations: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property square footage | ft² |  |  |  |  |  |  |  |  |  |  |  | 862 |  |  |  |  |  |  |  |  |  |  |  |  |
Assumption of debt |  |  |  |  |  |  |  |  |  |  |  | $ 115,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Chesterfield Towne Center And Centre At Salisbury |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Discontinued Operations: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale |  |  |  |  |  |  |  |  |  |  |  | 292,500 |  |  |  |  |  |  |  |  |  |  |  |  |
Cash payment |  |  |  |  |  |  |  |  |  |  |  | $ 67,763 |  |  |  |  |  |  |  |  |  |  |  |  |
Rotterdam Square |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Discontinued Operations: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale |  |  |  |  |  |  |  |  |  |  | $ 8,500 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on disposal |  |  |  |  |  |  |  |  |  |  | $ (472) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property square footage | ft² |  |  |  |  |  |  |  |  |  |  | 585 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Somersville Town Center |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Discontinued Operations: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale |  |  |  |  |  |  |  |  |  | $ 12,337 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on disposal |  |  |  |  |  |  |  |  |  | $ (263) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property square footage | ft² |  |  |  |  |  |  |  |  |  | 348 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Lake Square Mall |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Discontinued Operations: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale |  |  |  |  |  |  |  |  | $ 13,280 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on disposal |  |  |  |  |  |  |  |  | $ (876) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property square footage | ft² |  |  |  |  |  |  |  |  | 559 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash payment |  |  |  |  |  |  |  |  | $ 3,677 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
South Towne Center |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Discontinued Operations: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale |  |  |  | $ 205,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on disposal |  |  |  | $ 121,873 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property square footage | ft² |  |  |  | 1,278 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Panorama Mall |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Discontinued Operations: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale | $ 98,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on disposal |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 73,726 |  |  |  |
Property square footage | ft² | 312 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notes Receivable | Lake Square Mall |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Discontinued Operations: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notes receivable |  |  |  |  |  |  |  |  | $ 9,603 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of notes receivable | note |  |  |  |  |  |  |  |  | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Great Northern Mall |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Discontinued Operations: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on extinguishment of debt |  | $ (1,627) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Great Northern Mall | Great Northern Mall |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Discontinued Operations: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property square footage | ft² |  | 895 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on extinguishment of debt |  | $ (1,627) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition The cash inflow associated with the amount received from the sale of a portion of the company's business, for example a segment, division, branch or other business, during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3179-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 + Details
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