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Derivative Financial Instruments (Details) - USD ($) | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2019 | Mar. 31, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Dec. 31, 2018
Derivative [Line Items] |  |  |  |  |  |
Unrealized loss on forward starting swaps/Interest rate swaps | $ (646,000) |  | $ 862,000 | $ (2,550,000) | $ 8,739,000 |
Expected net decrease to interest expense | 1,000,000.0 |  |  | 1,000,000.0 |  |
Derivatives designated as cash flow hedges in prepaid expenses and other assets: |  |  |  |  |  |
Interest rate swaps | 0 |  |  | 0 |  | $ 1,146,000
Derivatives designated as cash flow hedges in accounts payable, accrued expenses and other liabilities: |  |  |  |  |  |
Interest rate swaps | 86,000 |  |  | 86,000 |  | 3,581,000
Amount of unrealized gains/(losses) recognized in accumulated other comprehensive income on derivatives: |  |  |  |  |  |
Unrealized loss on forward starting swaps/Interest rate swaps | (646,000) |  | 862,000 | (2,550,000) | 8,739,000 |
Amount of gains reclassified out of accumulated other comprehensive income into interest expense: |  |  |  |  |  |
Interest rate swaps | $ (360,000) |  | $ (515,000) | $ (875,000) | $ (621,000) |
4.20% (4.234% effective rate) Notes due 2029 [Member] |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Principal debt amount |  | $ 350,000,000.0 |  |  |  |
Interest rate (in hundredths) |  | 4.20% |  |  |  |
Scheduled maturity date |  | Apr. 15, 2029 |  |  |  |
Forward Starting Swaps [Member] |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Amount of borrowings, subject to swaps |  |  |  |  |  | $ 225,000,000.0
Underlying treasury rate term (in periods) |  |  |  |  |  | 10 years
Underlying treasury rate locked by forward-starting swaps (in hundredths) |  |  |  |  |  | 2.86%
Unrealized loss on forward starting swaps/Interest rate swaps |  | $ (5,100,000) |  |  |  |
Amount of unrealized gains/(losses) recognized in accumulated other comprehensive income on derivatives: |  |  |  |  |  |
Unrealized loss on forward starting swaps/Interest rate swaps |  | $ (5,100,000) |  |  |  |

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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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- Definition Face (par) amount of debt instrument at time of issuance. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28551-108399 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400 + Details
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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: 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(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/disclosureRef -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 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb)(2) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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- Definition Fair value, after offset of derivative liability, of financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, before offset against an obligation to return collateral under a master netting arrangement. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226008-175313 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226006-175313 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=109980867&loc=d3e41678-113959 + Details
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- Definition Maximum length of time over which the entity is hedging its exposure to the variability in future cash flows for forecasted transactions, excluding those forecasted transactions related to the payment of variable interest on existing financial instruments, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=112277219&loc=d3e80748-113994 + Details
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