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Summary of Significant Accounting Policies - Additional Information (Details) (USD $) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2014 tenant store | Sep. 30, 2013 | Sep. 30, 2014 tenant store | Sep. 30, 2013 | Dec. 31, 2013
Significant Accounting Policies [Line Items] |  |  |  |  |
Number of tenants | 1 |  | 1 |  |
Number of shopping centers | 31 |  | 31 |  |
Allowance for doubtful accounts receivables | $ 500,000 |  | $ 500,000 |  | $ 600,000
Period expected for the sale of property to occur |  |  | 1 year |  |
Deferred debt costs, net | 10,192,000 |  | 10,192,000 |  | 9,675,000
Accumulated amortization deferred leasing cost | 5,500,000 |  | 5,500,000 |  | 4,500,000
Deferred leasing costs, net | 26,751,000 |  | 26,751,000 |  | 26,052,000
Accumulated amortization deferred leasing cost | 20,300,000 |  | 20,300,000 |  | 16,600,000
Amortization expense deferred leasing cost |  |  | 3,900,000 | 5,000,000 |
Severance payments |  |  | 1,100,000 |  |
Defined benefit plan, benefits paid |  |  | 814,300 |  |
Interest expensed capitalized | 186,000 | 59,000 | 430,000 | 93,000 |
Commercial development projects, availability for occupancy, maximum period after major construction activity |  |  | 1 year |  |
Depreciation and amortization expense |  |  | 26,800,000 | 34,300,000 |
Decrease in depreciation expense |  |  | (7,500,000) |  |
Repairs and maintenance expense |  |  | 9,200,000 | 7,500,000 |
Property operating expenses | 6,316,000 | 6,106,000 | 20,039,000 | 18,096,000 |
Shares credited to directors' deferred fee accounts |  |  | 229,867 |  |
Percentage of ownership in Operating Partnership |  |  | 74.40% |  |
Snow Removal Costs |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Property operating expenses |  |  | 1,700,000 |  |
Van Ness Square |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Additional depreciation expense as a result of reduction in estimated useful life |  |  |  | 8,000,000 |
Estimated remaining useful life |  |  |  | 4 months |
Held-for-sale |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Number of real estate properties | 0 |  | 0 |  |
Minimum |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Accounts receivable, net representing rental income accrued | 38,100,000 |  | 38,100,000 |  | 37,200,000
Allowance for doubtful accounts receivables representing rental income accrued | $ 300,000 |  | $ 300,000 |  | $ 500,000
Minimum | Building |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Estimated useful life |  |  | 35 years |  |
Maximum | Building |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Estimated useful life |  |  | 50 years |  |
Maximum | Building Improvements |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Estimated useful life |  |  | 20 years |  |
Giant Food |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Percentage of total revenue |  |  | 4.50% |  |
Number of shopping centers |  |  | 9 |  |
Safeway |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Percentage of total revenue |  |  | 2.50% |  |
Number of shopping centers |  |  | 8 |  |
Revenues |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Number of tenants | 2 |  | 2 |  |
Percentage of total revenue |  |  | 2.50% |  |

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- Definition This element represents the amortization of deferred leasing fees incurred by the lessor and amortized over the term of the lease. Such fees represent (a) costs to originate a lease incurred in transactions with independent third parties that (i) result directly from and are essential to acquire that lease and (ii) would not have been incurred had that leasing transaction not occurred and (b) certain costs directly related to specified activities performed by the lessor for that lease. Those activities are: evaluating the prospective lessee's financial condition; evaluating and recording guarantees, collateral, and other security arrangements; negotiating lease terms; preparing and processing lease documents; and closing the transaction. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.3) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 25 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=6748888&loc=d3e40246-112709 + Details
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- Definition For an unclassified balance sheet, the accumulated amortization, as of the reporting date, which represents the periodic charge to earnings of initial direct costs which have been deferred and are being allocated over the lease term in proportion to the recognition of rental income. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 35 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6453741&loc=d3e40879-112712 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 25 -Paragraph 16 -URI http://asc.fasb.org/extlink&oid=6748888&loc=d3e40588-112709 + Details
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- Definition This element represents costs incurred by the lessor that are (a) costs to originate a lease incurred in transactions with independent third parties that (i) result directly from and are essential to acquire that lease and (ii) would not have been incurred had that leasing transaction not occurred and (b) certain costs directly related to specified activities performed by the lessor for that lease. Those activities are: evaluating the prospective lessee's financial condition; evaluating and recording guarantees, collateral, and other security arrangements; negotiating lease terms; preparing and processing lease documents; and closing the transaction. This element is net of accumulated amortization. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 25 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=6748888&loc=d3e40246-112709 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 35 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6453741&loc=d3e40879-112712 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 25 -Paragraph 16 -URI http://asc.fasb.org/extlink&oid=6748888&loc=d3e40588-112709 + Details
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- Definition For an unclassified balance sheet, the carrying amount (net of accumulated amortization) as of the balance sheet date of capitalized costs associated with the issuance of debt instruments (for example, legal, accounting, underwriting, printing, and registration costs) that will be charged against earnings over the life of the debt instruments to which such costs pertain. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28555-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.17) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 17 -Article 5 + Details
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