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Financial Instruments (Details) (Recurring [Member], USD $) In Thousands, unless otherwise specified | Sep. 30, 2012 | Jan. 01, 2012
--- | --- | ---
Carrying value and estimated fair value of financial instruments |  |
Interest rate swap derivative assets | $ 6,997 | $ 7,440
Restricted investments: |  |
Guaranteed Investment Contract | 5,742 | 5,742
Guaranteed Repurchase Agreements |  | 33,821
Rabbi Trust | 9,341 | 8,016
Fixed income securities | 2,172 | 2,013
Derivative Liabilities | 747 |
Quoted Prices in Active Markets (Level 1) [Member] |  |
Carrying value and estimated fair value of financial instruments |  |
Interest rate swap derivative assets | 0 | 0
Restricted investments: |  |
Guaranteed Investment Contract | 0 | 0
Guaranteed Repurchase Agreements |  | 0
Rabbi Trust | 9,341 | 5,898
Fixed income securities | 0 | 0
Derivative Liabilities | 0 |
Significant Other Observable Inputs (Level 2) [Member] |  |
Carrying value and estimated fair value of financial instruments |  |
Interest rate swap derivative assets | 6,997 | 7,440
Restricted investments: |  |
Guaranteed Investment Contract | 5,742 | 5,742
Guaranteed Repurchase Agreements |  | 33,821
Rabbi Trust | 0 | 2,118
Fixed income securities | 2,172 | 2,013
Derivative Liabilities | 747 |
Significant Unobservable Inputs (Level 3) [Member] |  |
Carrying value and estimated fair value of financial instruments |  |
Interest rate swap derivative assets | 0 | 0
Restricted investments: |  |
Guaranteed Investment Contract | 0 | 0
Guaranteed Repurchase Agreements |  | 0
Rabbi Trust | 0 | 0
Fixed income securities | 0 | 0
Derivative Liabilities | $ 0 |

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