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Financial Instruments and Fair Values - Narrative (Details) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2018 USD ($) derivative | Jun. 30, 2017 USD ($) | Jun. 30, 2018 USD ($) derivative | Jun. 30, 2017 USD ($) | Dec. 31, 2017 USD ($) derivative
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Interest rate swap agreements liability | $ 0 |  | $ 0 |  | $ (436,000)
Other comprehensive income (loss) | 1,763,000 | $ (14,410,000) | 5,943,000 | $ (13,016,000) |
Loss from derivative financial instruments | 0 | 42,000 | 0 | 289,000 |
Designated as Hedging Instrument | Cash Flow Hedging |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Amount expected to be reclassified within twelve months |  |  | (600,000) |  |
Deferred losses on terminated hedges | 14,400,000 |  | 14,400,000 |  | $ 15,100,000
Loss expected to be reclassified within twelve months |  |  | 1,500,000 |  |
Loss from derivative financial instruments |  | 40,000 |  | 300,000 |
Notional amount, terminated | $ 20,000,000 |  | $ 20,000,000 |  |
Designated as Hedging Instrument | Cash Flow Hedging | Interest Rate Swap |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Derivative, number of instruments held | derivative | 1 |  | 1 |  | 1
Notional amount | $ 265,000,000 |  | $ 265,000,000 |  | $ 265,000,000.0
Other comprehensive income (loss) | 2,300,000 | $ (14,400,000) | 7,100,000 | $ (13,000,000) |
Prepaid expenses and other assets | Designated as Hedging Instrument | Cash Flow Hedging | Interest Rate Swap |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Interest rate swap agreements asset | $ 6,000,000 |  | $ 6,000,000 |  |
Accounts payable and accrued expenses | Designated as Hedging Instrument | Cash Flow Hedging | Interest Rate Swap |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Interest rate swap agreements liability |  |  |  |  | $ (400,000)

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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 Fair value, after the effects of master netting arrangements, of a 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. Includes assets not subject to a master netting arrangement and not elected to be offset. + References Reference 1: 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 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=109250915&loc=d3e13433-108611 Reference 3: 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 + Details
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