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Financial Instruments (Details) - Recurring - USD ($) $ in Thousands | Jun. 30, 2017 | Dec. 31, 2016
--- | --- | ---
Restricted investment: |  |
Rabbi Trust | $ 18,624 | $ 15,662
Fixed income securities | 1,853 | 1,782
Interest rate cap derivatives |  | 15
Interest rate swap derivatives |  |
Liabilities: |  |
Interest rate swap derivatives | 19,248 | 18,679
Quoted Prices in Active Markets (Level 1) |  |
Restricted investment: |  |
Rabbi Trust | 0 | 0
Fixed income securities | 0 | 0
Interest rate cap derivatives |  | 0
Quoted Prices in Active Markets (Level 1) | Interest rate swap derivatives |  |
Liabilities: |  |
Interest rate swap derivatives | 0 | 0
Significant Other Observable Inputs (Level 2) |  |
Restricted investment: |  |
Rabbi Trust | 18,624 | 15,662
Fixed income securities | 1,853 | 1,782
Significant Other Observable Inputs (Level 2) | Interest rate swap derivatives |  |
Liabilities: |  |
Interest rate swap derivatives | 19,248 | 18,679
Significant Unobservable Inputs (Level 3) |  |
Restricted investment: |  |
Rabbi Trust | 0 | 0
Fixed income securities | 0 | 0
Interest rate cap derivatives |  | 0
Significant Unobservable Inputs (Level 3) | Interest rate swap derivatives |  |
Liabilities: |  |
Interest rate swap derivatives | $ 0 | $ 0

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