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Financial Instruments (Details) - Recurring - USD ($) $ in Thousands | Mar. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Restricted investment: |  |
Rabbi Trust | $ 14,664 | $ 13,071
Fixed income securities | 1,845 | 1,717
Interest rate cap derivatives assets | 47 | 93
Quoted Prices in Active Markets (Level 1) |  |
Restricted investment: |  |
Rabbi Trust | 0 | 0
Fixed income securities | 0 | 0
Interest rate cap derivatives assets | 0 | 0
Significant Other Observable Inputs (Level 2) |  |
Restricted investment: |  |
Rabbi Trust | 14,664 | 13,071
Fixed income securities | 1,845 | 1,717
Interest rate cap derivatives assets | 47 | 93
Significant Unobservable Inputs (Level 3) |  |
Restricted investment: |  |
Rabbi Trust | 0 | 0
Fixed income securities | 0 | 0
Interest rate cap derivatives assets | 0 | 0
Interest rate swap derivatives |  |
Liabilities: |  |
Interest rate swap derivatives | 23,706 | 20,835
Interest rate swap derivatives | Quoted Prices in Active Markets (Level 1) |  |
Liabilities: |  |
Interest rate swap derivatives | 0 | 0
Interest rate swap derivatives | Significant Other Observable Inputs (Level 2) |  |
Liabilities: |  |
Interest rate swap derivatives | 23,706 | 20,835
Interest rate swap derivatives | Significant Unobservable Inputs (Level 3) |  |
Liabilities: |  |
Interest rate swap derivatives | $ 0 | $ 0

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