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Financial Instruments and Fair Values - Narrative (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Derivative [Line Items] |  |
Interest rate swap agreements liability | $ 8,849,000 | $ 13,330,000
Interest rate swaps |  |
Derivative [Line Items] |  |
Interest rate swap agreements liability | 8,900,000 |
Designated as Hedging Instrument | Cash Flow Hedging |  |
Derivative [Line Items] |  |
Unrealized loss on valuation of interest rate swap agreements |  | 20,600,000
Loss expected to be reclassified within twelve months | 11,500,000 |
Designated as Hedging Instrument | Cash Flow Hedging | Interest rate swaps |  |
Derivative [Line Items] |  |
Aggregate notional value | 265,000,000.0 | 390,000,000.0
Unrealized loss on valuation of interest rate swap agreements | 10,500,000 |
Designated as Hedging Instrument | Cash Flow Hedging | Interest Rate Swap, Three Month LIBOR, 2.9580%, Swap | LIBOR |  |
Derivative [Line Items] |  |
Notional amount | 125,000,000 |
Payment of termination settlement fee | 20,300,000 |
Accounts payable and accrued expenses | Designated as Hedging Instrument | Cash Flow Hedging | Interest rate swaps |  |
Derivative [Line Items] |  |
Interest rate swap agreements liability | $ 8,800,000 | $ 13,300,000

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- Definition Fair value, after the effects of master netting arrangements, of a financial liability or 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 liabilities 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 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 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=121572278&loc=d3e13433-108611 Reference 3: 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 + Details
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