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Financial Instruments (Details) (Recurring, USD $) In Thousands, unless otherwise specified | Dec. 31, 2013 | Dec. 31, 2012
--- | --- | ---
Assets: |  |
Interest rate swap derivative assets |  | $ 6,212
Restricted investments: |  |
Guaranteed Investment Contract | 5,742 | 5,742
Rabbi Trust | 9,534 | 7,718
Fixed income securities | 1,993 | 2,152
Liabilities: |  |
Interest rate swap derivative liability | 390 | 708
Quoted Prices in Active Markets (Level 1) |  |
Assets: |  |
Interest rate swap derivative assets |  | 0
Restricted investments: |  |
Guaranteed Investment Contract | 0 | 0
Rabbi Trust | 0 | 0
Fixed income securities | 0 | 0
Liabilities: |  |
Interest rate swap derivative liability | 0 | 0
Significant Other Observable Inputs (Level 2) |  |
Assets: |  |
Interest rate swap derivative assets |  | 6,212
Restricted investments: |  |
Guaranteed Investment Contract | 5,742 | 5,742
Rabbi Trust | 9,534 | 7,718
Fixed income securities | 1,993 | 2,152
Liabilities: |  |
Interest rate swap derivative liability | 390 | 708
Significant Unobservable Inputs (Level 3) |  |
Assets: |  |
Interest rate swap derivative assets |  | 0
Restricted investments: |  |
Guaranteed Investment Contract | 0 | 0
Rabbi Trust | 0 | 0
Fixed income securities | 0 | 0
Liabilities: |  |
Interest rate swap derivative liability | $ 0 | $ 0

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