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Consolidated Statements of Stockholders’ Equity (USD $) In Thousands, except Share data | Total | Common Stock [Member] | Additional Paid-in Capital [Member] | Treasury Stock [Member] | Accumulated Other Comprehensive Income (Loss) [Member] | Retained Earnings [Member] | Interest Rate Swap [Member] | Interest Rate Swap [Member] Accumulated Other Comprehensive Income (Loss) [Member] | Natural Gas Swap [Member] | Natural Gas Swap [Member] Accumulated Other Comprehensive Income (Loss) [Member] | Corn Option [Member] | Corn Option [Member] Accumulated Other Comprehensive Income (Loss) [Member]
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Balance at Jan. 01, 2011 | $ 464,296 | $ 930 | $ 290,106 | $ (4,340) | $ (20,988) | $ 198,588 |  |  |  |  |  |
Balance (in shares) at Jan. 01, 2011 |  | 92,559,671 |  |  |  |  |  |  |  |  |  |
Net income | 169,418 |  |  |  |  | 169,418 |  |  |  |  |  |
Pension adjustments | (10,146) |  |  |  | 10,146 |  |  |  |  |  |  |
Derivative adjustments |  |  |  |  |  |  | 712 | 712 | (482) | (482) | 0 |
Foreign currency translation adjustments, net of tax | 0 |  |  |  |  |  |  |  |  |  |  |
Issuance of non-vested stock (in shares) |  | 174,285 |  |  |  |  |  |  |  |  |  |
Issuance of non-vested stock | 2,540 | 2 | 2,538 |  |  |  |  |  |  |  |  |
Stock-based compensation | 492 |  | 492 |  |  |  |  |  |  |  |  |
Tax benefits associated with stock-based compensation | 1,125 |  | 1,125 |  |  |  |  |  |  |  |  |
Treasury stock (in shares) |  | (88,364) |  |  |  |  |  |  |  |  |  |
Treasury stock | (1,248) |  |  | (1,248) |  |  |  |  |  |  |  |
Issuance of common stock (in shares) |  | 24,402,846 |  |  |  |  |  |  |  |  |  |
Issuance of common stock | 293,668 | 244 | 293,424 |  |  |  |  |  |  |  |  |
Balance at Dec. 31, 2011 | 920,375 | 1,176 | 587,685 | (5,588) | (30,904) | 368,006 |  |  |  |  |  |
Balance (in shares) at Dec. 31, 2011 |  | 117,048,438 |  |  |  |  |  |  |  |  |  |
Net income | 130,770 |  |  |  |  | 130,770 |  |  |  |  |  |
Pension adjustments | (1,169) |  |  |  | (1,169) |  |  |  |  |  |  |
Derivative adjustments |  |  |  |  |  |  | 159 | 159 | 391 | 391 | 194 | 194
Foreign currency translation adjustments, net of tax | 0 |  |  |  |  |  |  |  |  |  |  |
Issuance of non-vested stock (in shares) |  | 486,697 |  |  |  |  |  |  |  |  |  |
Issuance of non-vested stock | 6,813 | 5 | 6,808 |  |  |  |  |  |  |  |  |
Stock-based compensation | 3,727 |  | 3,727 |  |  |  |  |  |  |  |  |
Tax benefits associated with stock-based compensation | 2,652 |  | 2,652 |  |  |  |  |  |  |  |  |
Treasury stock (in shares) |  | (264,275) |  |  |  |  |  |  |  |  |  |
Treasury stock | (4,445) |  |  | (4,445) |  |  |  |  |  |  |  |
Issuance of common stock (in shares) |  | 544,131 |  |  |  |  |  |  |  |  |  |
Issuance of common stock | 2,969 | 5 | 2,964 |  |  |  |  |  |  |  |  |
Balance at Dec. 29, 2012 | 1,062,436 | 1,186 | 603,836 | (10,033) | (31,329) | 498,776 |  |  |  |  |  |
Balance (in shares) at Dec. 29, 2012 |  | 117,814,991 |  |  |  |  |  |  |  |  |  |
Net income | 108,967 |  |  |  |  | 108,967 |  |  |  |  |  |
Pension adjustments | 15,140 |  |  |  | 15,140 |  |  |  |  |  |  |
Derivative adjustments |  |  |  |  |  |  | 0 |  | 127 | 127 | 1,141 | 1,141
Foreign currency translation adjustments, net of tax | (14,502) |  |  |  | (14,502) |  |  |  |  |  |  |
Issuance of non-vested stock (in shares) |  | 387,681 |  |  |  |  |  |  |  |  |  |
Issuance of non-vested stock | 6,539 | 4 | 6,535 |  |  |  |  |  |  |  |  |
Stock-based compensation | 50 |  | 50 |  |  |  |  |  |  |  |  |
Tax benefits associated with stock-based compensation | 1,138 |  | 1,138 |  |  |  |  |  |  |  |  |
Treasury stock (in shares) |  | (185,919) |  |  |  |  |  |  |  |  |  |
Treasury stock | (3,238) |  |  | (3,238) |  |  |  |  |  |  |  |
Issuance of common stock (in shares) |  | 46,250,672 |  |  |  |  |  |  |  |  |  |
Issuance of common stock | 843,154 | 463 | 842,691 |  |  |  |  |  |  |  |  |
Balance at Dec. 28, 2013 | $ 2,020,952 | $ 1,653 | $ 1,454,250 | $ (13,271) | $ (29,423) | $ 607,743 |  |  |  |  |  |
Balance (in shares) at Dec. 28, 2013 |  | 164,267,425 |  |  |  |  |  |  |  |  |  |

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