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Financial Instruments (Details) - Recurring - USD ($) $ in Thousands | Sep. 30, 2015 | Dec. 31, 2014
--- | --- | ---
Restricted investment: |  |
Rabbi Trust | $ 12,459 | $ 11,281
Fixed income securities | 1,778 | 1,966
Interest rate cap derivatives assets | 210 | 570
Quoted Prices in Active Markets (Level 1) |  |
Restricted investment: |  |
Rabbi Trust | 0 | 0
Fixed income securities | 0 | 0
Interest rate cap derivatives assets | 0 |
Significant Other Observable Inputs (Level 2) |  |
Restricted investment: |  |
Rabbi Trust | 12,459 | 11,281
Fixed income securities | 1,778 | 1,966
Interest rate cap derivatives assets | 210 | 570
Significant Unobservable Inputs (Level 3) |  |
Restricted investment: |  |
Rabbi Trust | 0 | 0
Fixed income securities | 0 | 0
Interest rate cap derivatives assets | 0 |
Interest rate swap derivatives |  |
Liabilities: |  |
Interest rate swap derivatives | 22,113 | 19,248
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 | 22,113 | 19,248
Interest rate swap derivatives | Significant Unobservable Inputs (Level 3) |  |
Liabilities: |  |
Interest rate swap derivatives | $ 0 | $ 0

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