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Financial Instruments (Details) (Recurring [Member], USD $) In Thousands, unless otherwise specified | Dec. 31, 2012 | Jan. 01, 2012
--- | --- | ---
Assets: |  |
Interest rate swap derivative assets | $ 6,212 | $ 7,440
Restricted investments: |  |
Guaranteed Investment Contract | 5,742 | 5,742
Guaranteed Repurchase Agreements | 0 | 33,821
Rabbi Trust | 7,718 | 8,016
Fixed income securities | 2,152 | 2,013
Liabilities: |  |
Interest rate swap derivative liability | 708 |
Quoted Prices in Active Markets (Level 1) [Member] |  |
Assets: |  |
Interest rate swap derivative assets | 0 | 0
Restricted investments: |  |
Guaranteed Investment Contract | 0 | 0
Guaranteed Repurchase Agreements | 0 | 0
Rabbi Trust | 7,718 | 5,898
Fixed income securities | 0 | 0
Liabilities: |  |
Interest rate swap derivative liability | 0 |
Significant Other Observable Inputs (Level 2) [Member] |  |
Assets: |  |
Interest rate swap derivative assets | 6,212 | 7,440
Restricted investments: |  |
Guaranteed Investment Contract | 5,742 | 5,742
Guaranteed Repurchase Agreements | 0 | 33,821
Rabbi Trust | 0 | 2,118
Fixed income securities | 2,152 | 2,013
Liabilities: |  |
Interest rate swap derivative liability | 708 |
Significant Unobservable Inputs (Level 3) [Member] |  |
Assets: |  |
Interest rate swap derivative assets | 0 | 0
Restricted investments: |  |
Guaranteed Investment Contract | 0 | 0
Guaranteed Repurchase Agreements | 0 | 0
Rabbi Trust | 0 | 0
Fixed income securities | 0 | 0
Liabilities: |  |
Interest rate swap derivative liability | $ 0 |

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