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Other Comprehensive Income (Reclassification out of AOCI) (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended
--- | ---
Mar. 30, 2013 | Mar. 31, 2012
Reclassification out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Cost of sales and operating expenses | $ (322,686) |  | $ (276,469) |
Interest expense | (5,625) |  | (6,925) |
Amortization of prior service cost | (15) |  | (22) |
Amortization of actuarial loss | (1,300) |  | (1,189) |
Total before tax | 52,823 |  | 44,741 |
Income tax benefit/(expense) | (20,418) |  | (16,170) |
Net income | 32,405 |  | 28,571 |
Reclassification out of Accumulated Other Comprehensive Income [Member] |  |  |  |
Reclassification out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Net income | (814) |  | (1,321) |
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member] |  |  |  |
Reclassification out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Total before tax | (15) |  | (945) |
Income tax benefit/(expense) | 6 |  | 366 |
Net income | 9 |  | (579) |
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member] | Natural Gas Swap [Member] |  |  |  |
Reclassification out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Cost of sales and operating expenses | (57) |  | (713) |
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member] | Corn Option [Member] |  |  |  |
Reclassification out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Cost of sales and operating expenses | 42 |  | 0 |
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member] | Interest Rate Swap [Member] |  |  |  |
Reclassification out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Interest expense | 0 |  | (232) |
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Translation Adjustment [Member] |  |  |  |
Reclassification out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Amortization of prior service cost | (15) | [1] | (22) | [1]
Amortization of actuarial loss | (1,300) | [1] | (1,189) | [1]
Total before tax | (1,315) |  | (1,211) |
Income tax benefit/(expense) | 510 |  | 469 |
Net income | $ 805 |  | $ (742) |
[1] | These items are included in the computation of net periodic pension cost. See Note 12 Employee Benefit Plans for additional information.

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