Earnings Per Share (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended	9 Months Ended
Sep. 25, 2012	Sep. 27, 2011	Sep. 25, 2012	Sep. 27, 2011
Amounts used for basic and diluted per share calculations
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	$ 36,515	$ 28,848	$ 121,836	$ 97,332
Weighted average number of shares outstanding - basic (in shares)	29,242	29,548	29,209	29,756
Effect of dilutive stock-based employee compensation awards (in shares)	213	281	253	311
Weighted average number of shares outstanding - diluted (in shares)	29,455	29,829	29,462	30,067
Earnings per common share:
Basic (in dollars per share)	$ 1.25	$ 0.98	$ 4.17	$ 3.27
Diluted (in dollars per share)	$ 1.24	$ 0.97	$ 4.14	$ 3.24

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

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- Definition

The amount of net income (loss) for 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.

+ References+ Details

- Definition

The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest.

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- Definition

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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- Definition

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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