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Guarantor Financial Information (Condensed Consolidated Statements of Operations) (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended
--- | ---
Mar. 30, 2013 | Mar. 31, 2012
Net sales | $ 445,422 | $ 387,108
Costs and expenses: |  |
Cost of sales and operating expenses | 322,686 | 276,469
Selling, general and administrative expenses | 42,293 | 37,369
Depreciation and amortization | 21,867 | 20,760
Total costs and expenses | 386,846 | 334,598
Operating income | 58,576 | 52,510
Interest expense | (5,625) | (6,925)
Other income/(expense), net | 1,067 | (608)
Equity in net loss of unconsolidated subsidiary | (1,195) | (236)
Earnings in investments in subsidiaries | 0 | 0
Income before income taxes | 52,823 | 44,741
Income taxes | 20,418 | 16,170
Net income | 32,405 | 28,571
Issuer [Member] |  |
Net sales | 161,872 | 152,988
Costs and expenses: |  |
Cost of sales and operating expenses | 124,104 | 121,097
Selling, general and administrative expenses | 22,567 | 20,785
Depreciation and amortization | 6,138 | 6,296
Total costs and expenses | 152,809 | 148,178
Operating income | 9,063 | 4,810
Interest expense | (5,621) | (6,925)
Other income/(expense), net | 938 | (642)
Equity in net loss of unconsolidated subsidiary | 0 | 0
Earnings in investments in subsidiaries | 29,718 | 30,332
Income before income taxes | 34,098 | 27,575
Income taxes | 1,693 | (996)
Net income | 32,405 | 28,571
Guarantors [Member] |  |
Net sales | 319,411 | 273,509
Costs and expenses: |  |
Cost of sales and operating expenses | 234,521 | 194,813
Selling, general and administrative expenses | 19,686 | 16,545
Depreciation and amortization | 15,723 | 14,458
Total costs and expenses | 269,930 | 225,816
Operating income | 49,481 | 47,693
Interest expense | (4) | 0
Other income/(expense), net | 135 | 27
Equity in net loss of unconsolidated subsidiary | 0 | 0
Earnings in investments in subsidiaries | 0 | 0
Income before income taxes | 49,612 | 47,720
Income taxes | 19,177 | 17,246
Net income | 30,435 | 30,474
Non-guarantors [Member] |  |
Net sales | 4,134 | 2,554
Costs and expenses: |  |
Cost of sales and operating expenses | 4,056 | 2,502
Selling, general and administrative expenses | 40 | 39
Depreciation and amortization | 6 | 6
Total costs and expenses | 4,102 | 2,547
Operating income | 32 | 7
Interest expense | 0 | 0
Other income/(expense), net | (6) | 7
Equity in net loss of unconsolidated subsidiary | (1,195) | (236)
Earnings in investments in subsidiaries | 0 | 0
Income before income taxes | (1,169) | (222)
Income taxes | (452) | (80)
Net income | (717) | (142)
Eliminations [Member] |  |
Net sales | (39,995) | (41,943)
Costs and expenses: |  |
Cost of sales and operating expenses | (39,995) | (41,943)
Selling, general and administrative expenses | 0 | 0
Depreciation and amortization | 0 | 0
Total costs and expenses | (39,995) | (41,943)
Operating income | 0 | 0
Interest expense | 0 | 0
Other income/(expense), net | 0 | 0
Equity in net loss of unconsolidated subsidiary | 0 | 0
Earnings in investments in subsidiaries | (29,718) | (30,332)
Income before income taxes | (29,718) | (30,332)
Income taxes | 0 | 0
Net income | $ (29,718) | $ (30,332)

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