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Summary of Significant Accounting Policies - Narrative (Details) $ in Thousands |  | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | ---
Jun. 30, 2018 USD ($) tenant Property store shares | Jun. 30, 2018 USD ($) tenant Property store | Jun. 30, 2017 USD ($) | Jun. 30, 2018 USD ($) tenant Property store shares | Jun. 30, 2017 USD ($) | Dec. 31, 2017 USD ($)
Significant Accounting Policies [Line Items] |  |  |  |  |  |
Number of tenants | tenant | 1 | 1 |  | 1 |  |
Number of shopping centers | store | 32 | 32 |  | 32 |  |
Percentage of ownership in operating partnership |  |  |  | 73.90% |  |
Allowance for doubtful accounts receivables | $ 500 | $ 500 |  | $ 500 |  | $ 400
Accounts receivable, net representing rental income accrued | 43,800 | 43,800 |  | $ 43,800 |  | 44,100
Period expected for the sale of property to occur |  |  |  | 1 year |  |
Deferred debt costs | 8,648 | 8,648 |  | $ 8,648 |  | 6,900
Accumulated amortization, deferred debt costs | 7,100 | 7,100 |  | 7,100 |  | 8,200
Deferred leasing costs, net | 27,139 | 27,139 |  | 27,139 |  | 27,255
Accumulated amortization deferred leasing cost | $ 35,000 | 35,000 |  | 35,000 |  | 35,300
Amortization expense deferred leasing cost |  |  |  | 2,900 | $ 2,800 |
Interest capitalized |  | $ 1,442 | $ 825 | $ 2,586 | 1,595 |
Commercial development projects, availability for occupancy, maximum period after major construction activity |  |  |  | 1 year |  |
Depreciation expense |  |  |  | $ 19,800 | 20,200 |
Repairs and maintenance expense |  |  |  | $ 5,900 | $ 5,300 |
Shares credited to directors' deferred fee accounts (in shares) | shares | 155,288 |  |  | 4,619 |  |
Shares due to exercise of employee stock options and issuance of directors' deferred stock (in shares) | shares |  |  |  | 10,735 |  |
Held-for-sale |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |
Number of real estate properties | Property | 0 | 0 |  | 0 |  |
Minimum |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |
Allowance for doubtful accounts receivables representing rental income accrued | $ 200 | $ 200 |  | $ 200 |  | $ 200
Minimum | Building |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |
Estimated useful life (in years) |  |  |  | 35 years |  |
Maximum | Building |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |
Estimated useful life (in years) |  |  |  | 50 years |  |
Maximum | Building Improvements |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |
Estimated useful life (in years) |  |  |  | 20 years |  |
Giant Food |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |
Percentage of total revenue |  |  |  | 4.80% |  |
Number of shopping centers | store |  |  |  | 10 |  |
Capital One |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |
Percentage of total revenue |  |  |  | 2.70% |  |
Number of shopping centers | store |  |  |  | 18 |  |
Revenues |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |
Number of tenants | tenant | 2 | 2 |  | 2 |  |
Percentage of total revenue |  |  |  | 2.50% |  |
Glebe Road Construction Loan |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |
Deferred debt costs | $ 1,700 | $ 1,700 |  | $ 1,700 |  |
Common Stock |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |
Shares due to exercise of employee stock options and issuance of directors' deferred stock (in shares) | shares |  |  |  | 33,149 |  |

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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 840 -SubTopic 20 -Section 25 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=77902619&loc=d3e40246-112709 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=63488584&loc=d3e20235-122688 Reference 3: 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=98514028&loc=d3e3602-108585 + 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 25 -Paragraph 16 -URI http://asc.fasb.org/extlink&oid=77902619&loc=d3e40588-112709 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=77913719&loc=d3e40879-112712 + Details
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