Shareholders' Equity and Accumulated Other Comprehensive Income Changes in Shareholders' Equity (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	6 Months Ended
Jun. 29, 2012	Jul. 01, 2011	Jun. 29, 2012	Jul. 01, 2011
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance at December 31, 2011 of Stockholders' Equity Attributable to Parent			$ 373,071
Comprehensive Income (Loss)	14,670	15,067	29,131	34,106
Dividends			(8,439)
Employee stock plans and related tax benefit			2,651
Purchase of treasury shares			(659)	(858)
Share-based compensation activity			3,581
Ending Balance at June 29, 2012 of Stockholders' Equity Attributable to Parent	$ 399,336		$ 399,336

The change in equity [net assets] of a business enterprise during a period from transactions and other events and circumstances from non-owner sources which are attributable to the reporting entity. It includes all changes in equity during a period except those resulting from investments by owners and distributions to owners, but excludes any and all transactions which are directly or indirectly attributable to that ownership interest in subsidiary equity which is not attributable to the parent.

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Equity impact of aggregate cash, stock, and paid-in-kind dividends declared for all securities (common shares, preferred shares, etc.) during the period.

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- Definition

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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- Definition

Aggregate value of stock related to Restricted Stock Awards issued during the period.

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- Definition

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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