Shareholders' Equity and Accumulated Other Comprehensive Income Changes in Shareholders' Equity (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jul. 03, 2015	Jun. 27, 2014	Jul. 03, 2015	Jun. 27, 2014
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance		$ 540,625	$ 517,665	$ 511,292
Comprehensive Income	$ 25,987	19,001	34,939	30,896
Dividends declared			(9,799)	(8,652)
Employee stock plans and related tax benefit			3,262	4,639
Purchase of treasury shares			(4,539)	(843)
Share-based compensation expense	2,400	$ 2,000	4,024	$ 3,293
Ending Balance	$ 545,552		$ 545,552

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

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- Definition

Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

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-Glossary Other Comprehensive Income

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-Glossary Net Income

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Amount of paid and unpaid cash, stock, and paid-in-kind (PIK) dividends declared, for example, but not limited to, common and preferred stock.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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No definition available.

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The total cash inflow associated with the amount received from holders to acquire the entity's shares under incentive and share awards, including stock option exercises. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately.

+ References

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-Glossary Financing Activities

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Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.

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Equity impact of the cost of common and preferred stock that were repurchased during the period. Recorded using the cost method.

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