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Discontinued Operations (Narrative) (Details) - USD ($) |  |  | 3 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Feb. 02, 2015 | Jun. 05, 2013 | Jun. 30, 2014 | Dec. 31, 2013 | Jun. 30, 2013 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | May. 27, 2014 | May. 06, 2014 | Nov. 14, 2013
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Sales Price |  |  |  |  |  |  | $ 4,075,000 | $ 52,975,000 |  |  |  |
Gain on extinguishment of debt obligations |  |  |  |  |  |  |  | 1,423,000 | $ 10,452,000 |  |  |
Net proceeds from sales of real estate |  |  |  |  |  |  | 5,891,000 | 102,124,000 | 34,713,000 |  |  |
Mortgage repayments |  |  |  |  |  |  | $ 114,828,000 | 177,094,000 | 77,069,000 |  |  |
McCormick Place [Member] |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Mortgage loans payable and accrued interest for properties under conveyance process |  |  |  |  |  |  |  |  |  |  | $ 2,700,000 |
Carrying value of property held for sale |  |  |  |  |  |  |  |  |  |  | $ 1,800,000 |
Gahanna Discount Drug Mart Plaza [Member] |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Mortgage loans payable and accrued interest for properties under conveyance process |  |  |  |  |  |  |  |  |  | $ 5,000,000 |  |
Carrying value of property held for sale |  |  |  |  |  |  |  |  |  | $ 4,300,000 |  |
Westlake Discount Drug Mart Plaza [Member] |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Mortgage loans payable and accrued interest for properties under conveyance process |  |  | $ 3,400,000 |  |  |  |  |  |  |  |  |
Gain on extinguishment of debt obligations |  |  |  |  |  | $ 1,300,000 |  |  |  |  |  |
Net proceeds from sales of real estate |  |  | 2,100,000 |  |  |  |  |  |  |  |  |
Mortgage repayments |  |  | $ 2,100,000 |  |  |  |  |  |  |  |  |
Roosevelt II [Member] |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Mortgage loans payable and accrued interest for properties under conveyance process |  |  |  |  |  |  |  |  |  |  |  | $ 13,900,000
Carrying value of property held for sale |  |  |  |  |  |  |  |  |  |  |  | $ 4,700,000
Gain on extinguishment of debt obligations |  |  |  |  | $ 9,200,000 |  |  |  |  |  |  |
Discontinued Operations [Member] |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Sales Price |  |  |  |  |  |  |  | 74,761,000 | 46,393,000 |  |  |
Discontinued Operations [Member] | Huntingdon Plaza [Member] |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Sales Price |  | $ 2,200,000 |  |  |  |  |  |  |  |  |  |
Discontinued Operations [Member] | McCormick Place [Member] |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Sales Price | [1] |  |  |  |  |  |  | 2,679,000 |  |  |  |
Gain on extinguishment of debt obligations |  |  |  | $ 800,000 |  |  |  |  |  |  |  |
Discontinued Operations [Member] | Gahanna Discount Drug Mart Plaza [Member] |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Sales Price | [1] |  |  |  |  |  |  | $ 4,982,000 |  |  |  |
Gain on extinguishment of debt obligations |  |  |  | $ 600,000 |  |  |  |  |  |  |  |
Discontinued Operations [Member] | Westlake Discount Drug Mart Plaza [Member] |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Sales Price |  |  |  |  |  |  |  |  | 2,240,000 |  |  |
Discontinued Operations [Member] | Roosevelt II [Member] |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Sales Price | [1] |  |  |  |  |  |  |  | $ 13,878,000 |  |  |
[1] | Lender accepted a deed-in-lieu of foreclosure on the property. Sales price represents mortgage loan payable, accrued interest and other expenses forgiven upon title transfer.

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