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Selected Quarterly Financial Data (Unaudited) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2012 | Sep. 30, 2012 | Jul. 01, 2012 | Apr. 01, 2012 | Jan. 01, 2012 | Oct. 02, 2011 | Jul. 03, 2011 | Apr. 03, 2011 | Dec. 31, 2012 | Jan. 01, 2012 | Jan. 02, 2011
Company's quarterly financial data |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 378,731 | $ 369,115 | $ 371,174 | $ 360,042 | $ 354,473 | $ 354,728 | $ 356,012 | $ 341,959 | $ 1,479,062 | $ 1,407,172 | $ 1,084,592
Operating Income | 39,313 | 51,602 | 52,941 | 40,497 | 47,298 | 47,265 | 46,298 | 38,738 | 184,353 | 179,599 | 126,902
Net Income | 95,413 | 14,532 | 20,858 | 13,755 | 17,176 | 18,820 | 18,620 | 15,028 | 144,558 | 69,644 | 54,371
Net income loss from discontinued operations | $ (13,777) | $ 194 | $ 1,619 | $ 1,304 | $ 1,450 | $ 2,474 | $ 2,544 | $ 1,351 | $ (10,660) | $ 7,819 | $ 8,419
Basic earnings per share |  |  |  |  |  |  |  |  |  |  |
Income from continuing operations | $ 1.56 | $ 0.25 | $ 0.34 | $ 0.23 | $ 0.28 | $ 0.30 | $ 0.30 | $ 0.24 | $ 2.39 | $ 1.12 | $ 0.99
Income (loss) from discontinued operations | $ (0.23) | $ 0.00 | $ 0.03 | $ 0.02 | $ 0.02 | $ 0.04 | $ 0.04 | $ 0.02 | $ (0.17) | $ 0.12 | $ 0.15
Net income per share — basic | $ 1.33 | $ 0.26 | $ 0.37 | $ 0.25 | $ 0.30 | $ 0.34 | $ 0.33 | $ 0.26 | $ 2.21 | $ 1.24 | $ 1.15
Diluted: |  |  |  |  |  |  |  |  |  |  |
Income from continuing operations | $ 1.55 | $ 0.25 | $ 0.34 | $ 0.23 | $ 0.28 | $ 0.30 | $ 0.29 | $ 0.24 | $ 2.37 | $ 1.11 | $ 0.98
Income from discontinued operations | $ (0.22) | $ 0.00 | $ 0.03 | $ 0.02 | $ 0.02 | $ 0.04 | $ 0.04 | $ 0.02 | $ (0.17) | $ 0.12 | $ 0.15
Net income per share — diluted | $ 1.32 | $ 0.25 | $ 0.37 | $ 0.25 | $ 0.30 | $ 0.34 | $ 0.33 | $ 0.26 | $ 2.20 | $ 1.23 | $ 1.13

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