Earnings Per Share (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended	6 Months Ended
Jun. 28, 2014	Jun. 29, 2013	Jun. 28, 2014	Jun. 29, 2013
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share	600,000	1,300,000	600,000	1,300,000
Earnings Per Share Reconciliation [Abstract]
Net income	$ 96,529	$ 89,314	$ 166,831	$ 210,373
Net income per basic common share	$ 1.14	$ 1.04	$ 1.97	$ 2.45
Net income per diluted common share	$ 1.13	$ 1.03	$ 1.95	$ 2.42
Weighted-average number of basic common shares	84,462,000	85,482,000	84,731,000	85,814,000
Effect of dilutive stock option, restricted stock and restricted stock unit securities	715,000	1,094,000	807,000	1,136,000
Weighted-average number of diluted common shares and equivalents	85,177,000	86,576,000	85,538,000	86,950,000

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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The amount of net income (loss) from continuing operations per each share of common stock or unit outstanding during the reporting period.

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The amount of net income (loss) derived from continuing operations during the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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Net income after adjustments for dividends on preferred stock (declared in the period) and/or cumulative preferred stock (accumulated for the period).

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The sum of dilutive potential common shares or units used in the calculation of the diluted per-share or per-unit computation.

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The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.

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Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period.

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