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Acquisitions and Dispositions (Details) ft² in Thousands, $ in Thousands | 1 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
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 ($) | Jun. 30, 2015 USD ($) | Sep. 30, 2014 USD ($) | Jun. 30, 2014 USD ($) | Mar. 31, 2014 USD ($) | Jun. 30, 2015 USD ($) | Jun. 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 |  |  |  |  |  |  |  |  |  |  |  | $ 26,060 |  | $ 18,615 |  |  |  |
Net Proceeds |  |  |  |  |  |  |  |  |  |  |  | 11,073 |  | 17,886 |  |  |  |
Gain |  |  |  |  |  |  |  |  |  |  |  | 13,491 |  | 937 |  |  |  |
Loss on impairment |  |  |  |  |  |  |  | $ 2,781 |  | $ 106 |  | 2,781 | $ 17,256 |  |  |  |  |
Note receivable from sale of mall | $ 19,546 |  |  |  |  |  |  | 19,546 |  |  |  | 19,546 |  | 19,811 |  |  |  |
Gain on Extinguishment of Debt |  |  |  |  |  |  |  | 256 |  | 0 |  | 256 | $ 42,660 |  |  |  |  |
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 | 6 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 |  | 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 |  |  |  |  |  |  |  |  |  |  |  | 417 |  |  |  |  |  |
Income from acquiree included in consolidated financial statements |  |  |  |  |  |  |  |  |  |  |  | $ 187 |  |  |  |  |  |
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 Cash received for the sale of real estate that is not part of an investing activity during the current 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 (c) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3179-108585 + Details
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- Definition Revenue from the sale of commercial, industrial, or residential property during the period. This element is more likely than not relevant to an entity for which real estate operations are a principal activity. If real estate operations are not a principal activity, the reporting entity would likely use a gain (loss) on sale of property, plant, or equipment type element. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1(e)) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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