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Real Estate (Narrative) (Details) - USD ($) |  |  |  |  |  | 12 Months Ended
--- | --- | --- | --- | --- | --- | ---
Feb. 11, 2016 | Dec. 23, 2015 | Feb. 27, 2015 | Jan. 23, 2015 | Mar. 21, 2014 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |
Purchase price of acquired property |  |  |  |  |  | $ 42,991,000 | $ 38,861,000 | $ 32,818,000
Acquisition costs |  |  |  |  |  | 1,238,000 | 2,870,000 | 182,000
Sales price of real estate sold |  |  |  |  |  | 4,075,000 | 52,975,000 |
Impairment charges/(reversal), net |  |  |  |  |  | 212,000 | (3,148,000) | 172,000
Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |
Sales price of real estate sold |  |  |  |  |  |  |  | 3,541,000
Impairment charges/(reversal), net |  |  |  |  |  | $ (200,000) | (3,400,000) |
New London Mall [Member] |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |
Acquired ownership percentage in joint venture |  |  |  | 60.00% |  |  |  |
Percentage of joint venture ownership |  |  |  | 100.00% |  |  |  |
Payments to acquire interest in joint ventures |  |  |  | $ 27,300,000 |  |  |  |
Amount of purchase price paid in cash |  |  |  | 10,900,000 |  |  |  |
Amount of purchase price representing 60% share of in-place mortgage financing |  |  |  | $ 16,400,000 |  |  |  |
Percentage of share of in-place mortgage financing |  |  |  | 60.00% |  |  |  |
Lawndale Plaza [Member] |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |
Purchase price of acquired property |  |  | $ 25,200,000 |  |  |  |  |
Acquisition costs |  |  | $ 500,000 |  |  |  |  |
East River Park [Member] |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |
Purchase price of acquired property |  | $ 39,000,000 |  |  |  |  |  |
Acquisition costs |  | $ 700,000 |  |  |  |  |  |
Mortgage interest rate |  | 3.90% |  |  |  |  |  |
Mortgage maturity date |  | Sep. 01, 2022 |  |  |  |  |  |
East River Park [Member] | Parent Company [Member] |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |
Purchase price of acquired property |  | $ 20,500,000 |  |  |  |  |  |
Quartermaster Plaza [Member] |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |
Mortgage amount |  |  |  |  | $ 53,400,000 |  |  |
Purchase price of acquired property |  |  |  |  | 92,300,000 |  |  |
Quartermaster Plaza [Member] | Mortgage Loan Payable Maturing October 2015 [Member] |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |
Mortgage amount |  |  |  |  | $ 42,100,000 |  |  |
Mortgage interest rate |  |  |  |  | 5.30% |  |  |
Mortgage maturity date |  |  |  |  |  | Oct. 01, 2015 |  |
Quartermaster Plaza [Member] | Mortgage Loan Payable Maturing October 2014 [Member] |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |
Mortgage amount |  |  |  |  | $ 11,300,000 |  |  |
Mortgage interest rate |  |  |  |  | 5.50% |  |  |
Mortgage maturity date |  |  |  |  |  | Oct. 01, 2014 |  |
Land Parcels [Member] | Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |
Impairment charges/(reversal), net |  |  |  |  |  |  | $ (300,000) | $ 900,000
Liberty Marketplace [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |
Sales price of real estate sold | $ 15,000,000 |  |  |  |  |  |  |

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- Definition Payments To Acquire Real Estate Amount Representing In-Place Mortgage Financing + References No definition available. + Details
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- Definition Payments To Acquire Real Estate Cash Paid + References No definition available. + Details
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- Definition Percentage Of Share Of In-Place Mortgage Financing + References No definition available. + Details
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- Definition This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 23 -URI http://asc.fasb.org/extlink&oid=34752592&loc=d3e1043-128460 + Details
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- Definition Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(2)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 + Details
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- Definition The cash outflow associated with the investment in or advances to an entity in which the reporting entity shares control of the entity with another party or group. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3213-108585 + Details
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- Definition The cash outflow from the acquisition of a piece of land, anything permanently fixed to it, including buildings, structures on it and so forth; includes real estate intended to generate income for the owner; excludes real estate acquired for use by the owner. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3213-108585 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + 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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