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Financial Instruments (Tables) | 12 Months Ended
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Dec. 31, 2018
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |
Fair value assets and liabilities measured on recurring basis | The following table provides a summary of the Company’s significant financial assets and liabilities carried at fair value and measured on a recurring basis (in thousands):
|  |  |  | Fair Value Measurements at December 31, 2018
|  | Carrying Value at December 31, 2018 |  | Quoted Prices in Active Markets (Level 1) |  | Significant Other Observable Inputs (Level 2) |  | Significant Unobservable Inputs (Level 3)
Assets: |  |  |  |  |  |  |  |
Restricted investments: |  |  |  |  |  |  |  |
Rabbi Trust |  | $ | 20,892 |  |  | $ | — |  |  | $ | 20,892 |  |  | $ | — |
Fixed income securities |  | 1,801 |  |  | — |  |  | 1,801 |  |  | — |
Liabilities: |  |  |  |  |  |  |  |
Interest rate swap derivatives |  | $ | 8,638 |  |  | $ | — |  |  | $ | 8,638 |  |  | $ | — |
|  |  |  | Fair Value Measurements at December 31, 2017
|  | Carrying Value at December 31, 2017 |  | Quoted Prices in Active Markets (Level 1) |  | Significant Other Observable Inputs (Level 2) |  | Significant Unobservable Inputs (Level 3)
Assets: |  |  |  |  |  |  |  |
Restricted investments: |  |  |  |  |  |  |  |
Rabbi Trust |  | $ | 20,763 |  |  | $ | — |  |  | $ | 20,763 |  |  | $ | — |
Fixed income securities |  | 1,902 |  |  | — |  |  | 1,902 |  |  | — |
Liabilities: |  |  |  |  |  |  |  |
Interest rate swap derivatives |  | $ | 13,992 |  |  | $ | — |  |  | $ | 13,992 |  |  | $ | — |

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- Definition Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19190-110258 + Details
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