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Financial Instruments (Details) - USD ($) $ in Thousands | 6 Months Ended |
--- | --- | ---
Jun. 30, 2018 | Dec. 31, 2017
Liabilities: |  |
Accounts receivable, transferred to third party | $ 6,900 |
Proceeds from sale of receivables | 6,900 |
Recurring |  |
Restricted investment: |  |
Rabbi Trust | 22,253 | $ 20,763
Fixed income securities | 1,839 | 1,902
Recurring | Interest rate swap derivatives |  |
Liabilities: |  |
Interest rate swap derivatives | 10,445 | 13,992
Recurring | Quoted Prices in Active Markets (Level 1) |  |
Restricted investment: |  |
Rabbi Trust | 0 | 0
Fixed income securities | 0 | 0
Recurring | Quoted Prices in Active Markets (Level 1) | Interest rate swap derivatives |  |
Liabilities: |  |
Interest rate swap derivatives | 0 | 0
Recurring | Significant Other Observable Inputs (Level 2) |  |
Restricted investment: |  |
Rabbi Trust | 22,253 | 20,763
Fixed income securities | 1,839 | 1,902
Recurring | Significant Other Observable Inputs (Level 2) | Interest rate swap derivatives |  |
Liabilities: |  |
Interest rate swap derivatives | 10,445 | 13,992
Recurring | Significant Unobservable Inputs (Level 3) |  |
Restricted investment: |  |
Rabbi Trust | 0 | 0
Fixed income securities | 0 | 0
Recurring | Significant Unobservable Inputs (Level 3) | Interest rate swap derivatives |  |
Liabilities: |  |
Interest rate swap derivatives | $ 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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=82849420&loc=SL20226008-175313 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13495-108611 Reference 3: http://www.xbrl.org/2003/role/presentationRef -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 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13433-108611 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41271-113958 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958 + Details
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