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Real Estate (Narrative) (Details) - USD ($) |  |  |  |  |  |  | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | ---
Feb. 22, 2017 | May 04, 2016 | Feb. 27, 2016 | Feb. 25, 2016 | Dec. 23, 2015 | Jan. 23, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |  |
Purchase price of acquired property |  |  |  |  |  |  | $ 31,923,000 | $ 42,991,000 | $ 38,861,000
Acquisition costs |  |  |  |  |  |  | 3,426,000 | 1,238,000 | 2,870,000
Impairment charges/(reversal), net |  |  |  |  |  |  | (6,347,000) | 212,000 | (3,148,000)
Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] |  |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |  |
Impairment charges/(reversal), net |  |  |  |  |  |  | $ 6,300,000 | $ 200,000 | $ 3,100,000
Christina Crossing [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |  |
Purchase price of acquired property | $ 29,300,000 |  |  |  |  |  |  |  |
Shoppes at Arts District [Member] |  |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |  |
Purchase price of acquired property |  |  |  | $ 20,500,000 |  |  |  |  |
Mortgage interest rate |  |  |  | 5.20% |  |  |  |  |
Mortgage maturity date |  |  |  | Apr. 01, 2022 |  |  |  |  |
Shoppes at Arts District [Member] | Parent Company [Member] |  |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |  |
Purchase price of acquired property |  |  |  | $ 8,500,000 |  |  |  |  |
Glenwood Village [Member] |  |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |  |
Purchase price of acquired property |  | $ 19,500,000 |  |  |  |  |  |  |
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 |  |  |  |
Mortgage interest rate |  |  |  |  | 3.90% |  |  |  |
Mortgage maturity date |  |  |  |  | Sep. 01, 2022 |  |  |  |
Acquisition costs |  |  |  |  | $ 700,000 |  |  |  |
East River Park [Member] | Parent Company [Member] |  |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |  |
Purchase price of acquired property |  |  |  |  | $ 20,500,000 |  |  |  |

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- Definition Impairment Reversals Of Real Estate + References No definition available. + Details
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- Definition Joint Venture Acquired Ownership Percentage + References No definition available. + Details
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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 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=73531572&loc=d3e1043-128460 + Details
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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + 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)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + 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 + 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=66902209&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=66902209&loc=d3e3213-108585 + Details
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