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Mortgage Loans Payable and Credit Facility (Narrative) (Details) - USD ($) |  | 6 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 08, 2017 | Jun. 30, 2018 | Jul. 24, 2018 | Dec. 31, 2017
Line Of Credit Facility [Line Items] |  |  |  |
Other assets and deferred charges, net |  | $ 41,258,000 |  | $ 35,350,000
Approximate amount of accumulated other comprehensive loss to be reclassified into earnings |  | 1,800,000 |  |
Interest Rate Swap [Member] |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |
Interest rate swaps liability |  | 100,000 |  |
Derivative, notional amount |  | 400,000,000 |  | $ 350,000,000
Cash Flow Hedging, Count 3 [Member] | Interest Rate Swap [Member] |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |
Other assets and deferred charges, net |  | $ 13,800,000 |  |
Unsecured credit facility [Member] |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |
Credit facility borrowing capacity | $ 300,000,000 |  |  |
Aggregate borrowing capacity including increase under accordion feature | $ 750,000,000 |  |  |
Revolving Credit Facility [Member] |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |
Line of credit facility extension allowed period | 1 year | 1 year |  |
Basis spread on borrowings variable rate |  | 1.35% |  |
Revolving Credit Facility [Member] | Minimum [Member] |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |
Basis spread on borrowings variable rate | 1.35% |  |  |
Revolving Credit Facility [Member] | Maximum [Member] |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |
Basis spread on borrowings variable rate | 1.95% |  |  |
Revolving Credit Facility [Member] | Unsecured credit facility [Member] |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |
Credit facility borrowing capacity | $ 250,000,000 |  |  |
Credit facility expiration date | Sep. 08, 2021 |  |  |
Remaining borrowing capacity |  | $ 109,200,000 |  |
Term loan facility [Member] |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |
Basis spread on borrowings variable rate |  | 1.30% |  |
Term loan facility [Member] | Minimum [Member] |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |
Basis spread on borrowings variable rate | 1.30% |  |  |
Term loan facility [Member] | Maximum [Member] |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |
Basis spread on borrowings variable rate | 1.90% |  |  |
Term loan facility [Member] | Unsecured credit facility [Member] |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |
Credit facility borrowing capacity | $ 50,000,000 |  |  |
Credit facility expiration date | Sep. 08, 2022 |  |  |
Term Loan Maturing July 24, 2025 [Member] | Unsecured credit facility [Member] |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |
Loan maturity date |  | Jul. 24, 2018 |  |
Debt instrument, description |  | Proceeds from the term loan can be drawn at any time from closing until October 24, 2018, and are expected to be used primarily to repay mortgages maturing through November 2022. |  |
Mortgages maturity period |  | 2022-11 |  |
Effective interest rate |  | 4.60% |  |
Term Loan Maturing July 24, 2025 [Member] | Unsecured credit facility [Member] | Subsequent Event [Member] |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |
Term loan amount |  |  | $ 75,000,000 |
Term Loan Maturing July 24, 2025 [Member] | Unsecured credit facility [Member] | Minimum [Member] |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |
Basis spread on borrowings variable rate |  | 1.70% |  |
Term Loan Maturing July 24, 2025 [Member] | Unsecured credit facility [Member] | Maximum [Member] |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |
Basis spread on borrowings variable rate |  | 2.25% |  |

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- Definition Identification of the lender and information about a contractual promise to repay a short-term or long-term obligation, which includes borrowings under lines of credit, notes payable, commercial paper, bonds payable, debentures, and other contractual obligations for payment. This may include rationale for entering into the arrangement, significant terms of the arrangement, which may include amount, repayment terms, priority, collateral required, debt covenants, borrowing capacity, call features, participation rights, conversion provisions, sinking-fund requirements, voting rights, basis for conversion if convertible and remarketing provisions. The description may be provided for individual debt instruments, rational groupings of debt instruments, or by debt in total. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21475-112644 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(13)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 6: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(19)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 7: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=75038535&loc=d3e64711-112823 + Details
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