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Significant Accounting Policies - Deferred Leasing Commissions and Revenue Recognition (Details) | 3 Months Ended | 12 Months Ended
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Dec. 31, 2017 USD ($) shares | Sep. 30, 2017 shares | Jun. 30, 2017 shares | Mar. 31, 2017 shares | Dec. 31, 2016 shares | Sep. 30, 2016 shares | Jun. 30, 2016 shares | Mar. 31, 2016 shares | Dec. 31, 2017 USD ($) item shares | Dec. 31, 2016 USD ($) shares | Dec. 31, 2015 USD ($) shares
Deferred Leasing Commissions |  |  |  |  |  |  |  |  |  |  |
Amortization of deferred leasing commissions |  |  |  |  |  |  |  |  | $ 6,919,000 | $ 6,272,000 | $ 5,680,000
Estimated annual amortization of deferred leasing commissions for the succeeding five years |  |  |  |  |  |  |  |  |  |  |
2018 |  |  |  |  |  |  |  |  | 7,655,000 |  |
2019 |  |  |  |  |  |  |  |  | 7,027,000 |  |
2020 |  |  |  |  |  |  |  |  | 6,148,000 |  |
2021 |  |  |  |  |  |  |  |  | 5,379,000 |  |
2022 |  |  |  |  |  |  |  |  | 4,112,000 |  |
2023 and thereafter |  |  |  |  |  |  |  |  | 10,358,000 |  |
Summary of rental revenue |  |  |  |  |  |  |  |  |  |  |
Income from leases |  |  |  |  |  |  |  |  | 205,690,000 | 192,055,000 | 185,738,000
Reimbursable expenses |  |  |  |  |  |  |  |  | 58,777,000 | 49,821,000 | 49,512,000
Straight-line rent adjustment |  |  |  |  |  |  |  |  | 1,767,000 | 1,977,000 | 2,448,000
Amortization of favorable and unfavorable leases |  |  |  |  |  |  |  |  | 1,031,000 | 496,000 | 158,000
Rental revenue |  |  |  |  |  |  |  |  | $ 267,265,000 | $ 244,349,000 | $ 237,856,000
Segment Reporting |  |  |  |  |  |  |  |  |  |  |
Number of reporting segments | item |  |  |  |  |  |  |  |  | 1 |  |
Net Income Per Share |  |  |  |  |  |  |  |  |  |  |
Potential dilutive shares outstanding | shares |  |  |  |  |  |  |  |  | 0 | 0 | 0
Denominator used for calculating basic and diluted net income per share (in shares) | shares | 107,231,000 | 107,231,000 | 107,231,000 | 107,231,000 | 107,231,000 | 103,709,000 | 100,187,000 | 100,187,000 | 107,231,000 | 102,843,000 | 100,187,000
Derivative instruments |  |  |  |  |  |  |  |  |  |  |
Fair value hedges outstanding | $ 0 |  |  |  |  |  |  |  | $ 0 |  |
ASU 2016-02 |  |  |  |  |  |  |  |  |  |  |
Recent Accounting Standards |  |  |  |  |  |  |  |  |  |  |
Increase in assets and liabilities |  |  |  |  |  |  |  |  | $ 3,000,000 |  |

X
- Definition The net amount of expense (income) recorded in earnings to allocate the value of the identifiable intangible asset or liability established for an assumed above or below-market lease acquired in an acquisition. + References No definition available. + Details
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- References No definition available. + Details
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- Definition The amount of amortization expense expected to be recognized for the remainder of deferred leasing commissions useful life after the fifth succeeding fiscal year. + References No definition available. + Details
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- Definition The amount of amortization of deferred leasing commissions expected to be recognized during the year five of the five succeeding fiscal years. + References No definition available. + Details
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- Definition The amount of amortization of deferred leasing commissions expected to be recognized during the year four of the five succeeding fiscal years. + References No definition available. + Details
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- Definition The amount of amortization of deferred leasing commissions expected to be recognized during the year one of the five succeeding fiscal years. + References No definition available. + Details
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- Definition The amount of amortization of deferred leasing commissions expected to be recognized during the year three of the five succeeding fiscal years. + References No definition available. + Details
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- Definition The amount of amortization of deferred leasing commissions expected to be recognized during the year two of the five succeeding fiscal years. + References No definition available. + Details
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- Definition The adjustment during the reporting period in the amount due that is the result of the cumulative difference between actual rent due and rental income recognized on a straight-line basis. + References No definition available. + Details
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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 Net fair value of all derivative instruments designated as fair value hedging instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958 + Details
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- Definition The total amount of revenue recognized for the period from operating leases, including minimum lease revenue, contingent revenue, percentage revenue and sublease revenue. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 25 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=77902458&loc=d3e39896-112707 + Details
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- Definition The aggregate revenue from real estate operations during the reporting period. + 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=63488584&loc=d3e20235-122688 + Details
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- Definition In accordance with the provisions of their lease agreement, this element represents allowable charges due a landlord from its tenant. In retail store and office building leases, for example, tenant reimbursements may cover items such as taxes, utilities, and common area expenses. + 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=63488584&loc=d3e20235-122688 + Details
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- Definition The sum of dilutive potential common shares or units used in the calculation of the diluted per-share or per-unit computation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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- Definition Average number of shares or units issued and outstanding that are used in calculating basic and diluted earnings per share (EPS). + References No definition available. + Details
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