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Acquisitions and Dispositions (Details) $ in Thousands | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Jul. 31, 2015 USD ($) | Jun. 30, 2015 USD ($) ft² tenant_space | Apr. 30, 2015 USD ($) | Oct. 31, 2014 USD ($) | Sep. 30, 2014 USD ($) | Jun. 30, 2014 USD ($) | May. 31, 2014 USD ($) | Jan. 31, 2014 USD ($) | Sep. 30, 2015 USD ($) | Jun. 30, 2015 USD ($) | Sep. 30, 2014 USD ($) | Jun. 30, 2014 USD ($) | Mar. 31, 2014 USD ($) | Sep. 30, 2015 USD ($) | Sep. 30, 2014 USD ($) | Dec. 31, 2014 USD ($) | Dec. 31, 2013 USD ($) | Dec. 31, 2011 USD ($) | Jun. 18, 2015 USD ($) | Apr. 30, 2014 USD ($)
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gross Sales Price |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 31,760 |  | $ 18,615 |  |  |  |
Net Proceeds |  |  |  |  |  |  |  |  |  |  |  |  |  | 16,545 |  | 17,886 |  |  |  |
Gain |  |  |  |  |  |  |  |  |  |  |  |  |  | 16,260 |  | 937 |  |  |  |
Loss on impairment |  |  |  |  |  |  |  |  | $ 884 |  | $ 497 |  |  | 3,665 | $ 17,753 |  |  |  |  |
Note receivable from sale of mall |  |  |  |  |  |  |  |  | 18,347 |  |  |  |  | 18,347 |  | 19,811 |  |  |  |
Gain on Extinguishment of Debt |  |  |  |  |  |  |  |  | 0 |  | 18,282 |  |  | 256 | $ 60,942 |  |  |  |  |
Madison Plaza |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gross Sales Price | $ 5,700 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net Proceeds | 5,472 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain | $ 2,769 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Eastgate Crossing |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gross Sales Price |  | $ 21,060 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net Proceeds |  | 6,118 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain |  | 13,491 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Earn out proceeds |  | $ 1,740 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Minimum number of tenant spaces to be leased required to receive earn out proceeds | tenant_space |  | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Minimum square feet per tenant space leased required to receive earn out proceeds | ft² |  | 5,800 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mortgage loan assumed at sale |  | $ 14,570 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Madison Square |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gross Sales Price |  |  | $ 5,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net Proceeds |  |  | 4,955 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain |  |  | $ 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss on impairment |  |  |  |  |  |  |  |  |  | $ 2,620 |  |  |  |  |  |  |  |  |  |
Pemberton Plaza |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gross Sales Price |  |  |  |  | $ 1,975 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net Proceeds |  |  |  |  | 1,886 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain |  |  |  |  | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss on impairment |  |  |  |  |  |  |  |  |  |  | $ 497 |  |  |  |  |  |  |  |  |
Foothills Plaza Expansion |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gross Sales Price |  |  |  |  |  | $ 2,640 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net Proceeds |  |  |  |  |  | 2,387 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain |  |  |  |  |  | $ 937 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Lakeshore Mall |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gross Sales Price |  |  |  |  |  |  | $ 14,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Net Proceeds |  |  |  |  |  |  | 13,613 |  |  |  |  |  |  |  |  |  |  |  |  |
Gain |  |  |  |  |  |  | 0 |  |  |  |  |  |  |  |  |  |  |  |  |
Loss on impairment |  |  |  |  |  |  |  |  |  |  |  | $ 106 | $ 5,100 |  |  |  |  |  |  |
Columbia Place |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss on impairment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 50,683 |  |
Balance of Non-recourse Debt |  |  |  | $ 27,265 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain on Extinguishment of Debt |  |  |  | $ 27,171 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Noncash or Part Noncash Divestiture, Interest Expense |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,181 |  |  |  |
Chapel Hill Mall |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss on impairment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 12,050 |  |  |  |
Balance of Non-recourse Debt |  |  |  |  | 68,563 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain on Extinguishment of Debt |  |  |  |  | $ 18,296 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Noncash or Part Noncash Divestiture, Interest Expense |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,514 |  |  |  |
Citadel Mall |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss on impairment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 20,453 |  |  |
Balance of Non-recourse Debt |  |  |  |  |  |  |  | $ 68,169 |  |  |  |  |  |  |  |  |  |  |  |
Gain on Extinguishment of Debt |  |  |  |  |  |  |  | $ 43,932 |  |  |  |  |  |  |  |  |  |  |  |
Notes Receivable |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Note receivable from sale of mall |  |  |  |  |  |  |  |  | 10,488 |  |  |  |  | 10,488 |  | 10,488 |  |  |  |
Notes Receivable | Lakeshore Mall |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Note receivable from sale of mall |  |  |  |  |  |  | 10,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Cash | Lakeshore Mall |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net Proceeds |  |  |  |  |  |  | $ 4,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Inputs, Level 3 | Lakeshore Mall |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value of real estate investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 13,780
Columbia Place Chapel Hill and Citadel Mall |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance of Non-recourse Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 163,997 |  |  |  |
Gain on Extinguishment of Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 89,399 |  |  |  |
Mayfaire Town Center and Community Center |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business combination, ownership percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 100.00% |
Revenue from acquiree included in consolidated financial statements |  |  |  |  |  |  |  |  | 4,314 |  |  |  |  | 4,731 |  |  |  |  |  |
Income from acquiree included in consolidated financial statements |  |  |  |  |  |  |  |  | $ 526 |  |  |  |  | $ 713 |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Land |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 39,598 |
Buildings and improvements |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 139,818 |
Tenant improvements |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,331 |
Above-market leases |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 393 |
In-place leases |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 22,673 |
Total assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 205,813 |
Below-market leases |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (13,825) |
Net assets acquired |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 191,988 |
Adjustments | Mayfaire Town Center and Community Center |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Land |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (620) |
Buildings and improvements |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,368 |
Tenant improvements |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (51) |
Above-market leases |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 114 |
In-place leases |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (465) |
Total assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 346 |
Below-market leases |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (346) |
Net assets acquired |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 |
Previously Reported | Mayfaire Town Center and Community Center |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Land |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 40,218 |
Buildings and improvements |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 138,450 |
Tenant improvements |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,382 |
Above-market leases |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 279 |
In-place leases |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 23,138 |
Total assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 205,467 |
Below-market leases |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (13,479) |
Net assets acquired |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 191,988 |

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- Definition This element represents the amount of revenue of the acquiree since the acquisition date included in the consolidated income statement for the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=56956515&loc=d3e1392-128463 + Details
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- Definition Amount represents the difference between the cash acquisition price of the debt and the net carrying amount of the debt at the time of its extinguishment (or deconsolidation of in-substance real estate when an entity defaults on its debt obligations). + References No definition available. + Details
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