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Financial Instruments (Details) - Recurring - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Restricted investments: |  |
Rabbi Trust | $ 20,763 | $ 15,662
Fixed income securities | 1,902 | 1,782
Quoted Prices in Active Markets (Level 1) |  |
Restricted investments: |  |
Rabbi Trust | 0 | 0
Fixed income securities | 0 | 0
Significant Other Observable Inputs (Level 2) |  |
Restricted investments: |  |
Rabbi Trust | 20,763 | 15,662
Fixed income securities | 1,902 | 1,782
Significant Unobservable Inputs (Level 3) |  |
Restricted investments: |  |
Rabbi Trust | 0 | 0
Fixed income securities | 0 | 0
Interest Rate Swap |  |
Liabilities: |  |
Interest rate swap derivative liability | 13,992 | 18,679
Interest Rate Swap | Quoted Prices in Active Markets (Level 1) |  |
Liabilities: |  |
Interest rate swap derivative liability | 0 | 0
Interest Rate Swap | Significant Other Observable Inputs (Level 2) |  |
Liabilities: |  |
Interest rate swap derivative liability | 13,992 | 18,679
Interest Rate Swap | Significant Unobservable Inputs (Level 3) |  |
Liabilities: |  |
Interest rate swap derivative liability | $ 0 | $ 0

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