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Financial Instruments (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018
Liabilities: |  |
Accounts receivable, transferred to third party | $ 3,000 | $ 6,900
Proceeds from sale and collection of receivables | 3,000 | 6,900
Recurring |  |
Restricted investments: |  |
Rabbi Trust | 28,332 | 20,892
Fixed income securities | 1,892 | 1,801
Recurring | Quoted Prices in Active Markets (Level 1) |  |
Restricted investments: |  |
Rabbi Trust | 0 | 0
Fixed income securities | 0 | 0
Recurring | Significant Other Observable Inputs (Level 2) |  |
Restricted investments: |  |
Rabbi Trust | 28,332 | 20,892
Fixed income securities | 1,892 | 1,801
Recurring | Significant Unobservable Inputs (Level 3) |  |
Restricted investments: |  |
Rabbi Trust | 0 | 0
Fixed income securities | 0 | 0
Interest Rate Swap | Recurring |  |
Liabilities: |  |
Interest rate swap derivative liability | 1,869 | 8,638
Interest Rate Swap | Recurring | Quoted Prices in Active Markets (Level 1) |  |
Liabilities: |  |
Interest rate swap derivative liability | 0 | 0
Interest Rate Swap | Recurring | Significant Other Observable Inputs (Level 2) |  |
Liabilities: |  |
Interest rate swap derivative liability | 1,869 | 8,638
Interest Rate Swap | Recurring | Significant Unobservable Inputs (Level 3) |  |
Liabilities: |  |
Interest rate swap derivative liability | $ 0 | $ 0

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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=118260190&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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