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Financial Instruments (Details) (Recurring [Member], USD $) In Thousands, unless otherwise specified | Mar. 31, 2014 | Dec. 31, 2013
--- | --- | ---
Restricted investments: |  |
Guaranteed Investment Contract | $ 5,742 | $ 5,742
Rabbi Trust | 10,325 | 9,534
Fixed income securities | 1,970 | 1,993
Liabilities: |  |
Interest rate swap derivative liabilities | 352 | 390
Quoted Prices in Active Markets (Level 1) |  |
Restricted investments: |  |
Guaranteed Investment Contract | 0 | 0
Rabbi Trust | 0 | 0
Fixed income securities | 0 | 0
Liabilities: |  |
Interest rate swap derivative liabilities | 0 | 0
Significant Other Observable Inputs (Level 2) |  |
Restricted investments: |  |
Guaranteed Investment Contract | 5,742 | 5,742
Rabbi Trust | 10,325 | 9,534
Fixed income securities | 1,970 | 1,993
Liabilities: |  |
Interest rate swap derivative liabilities | 352 | 390
Significant Unobservable Inputs (Level 3) |  |
Restricted investments: |  |
Guaranteed Investment Contract | 0 | 0
Rabbi Trust | 0 | 0
Fixed income securities | 0 | 0
Liabilities: |  |
Interest rate swap derivative liabilities | $ 0 | $ 0

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