Stock-Based Compensation (Details 2) (USD $) In Thousands, except Per Share data, unless otherwise specified	6 Months Ended
Jul. 02, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of options, outstanding	1,254
Number of options, granted	0
Number of options, exercised	(534)
Number of options, cancelled or forfeited	(40)
Number of options, outstanding	680
Number of options, vested and expected to vest at July 2, 2011	680
Number of options, exercisable at July 2, 2011	582
Weighted average exercise price of options, Outstanding	$ 15.04
Weighted average exercise price of options, granted	$ 0
Weighted average exercise price of options, exercised	$ 14.87
Weighted average exercise price of options, cancelled or forfeited	$ 15.18
Weighted average exercise price of options, outstanding	$ 15.16
Weighted average exercise price of options, vested and expected to vest	$ 15.16
Weighted average exercise price of options, exercisable at July 2, 2011	$ 15.41
Remaining contractual term of options, outstanding at July 2, 2011	1.67
Remaining contractual term of options, vested and expected to vest at July 2, 2011	1.67
Remaining contractual term of options, exercisable at July 2, 2011	1.33

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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The weighted average period between the balance sheet date and expiration for all vested portions of options outstanding and currently exercisable (or convertible) under the plan, which may be expressed in a decimal value for number of years.

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The weighted average price at which option holders acquired shares when converting their stock options into shares under the plan during the reporting period.

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For presentations that combine terminations, the number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan or that expired.

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The combined weighted average exercise price associated with stock options during the period that have either lapsed or been forfeited.

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Net number of share options (or share units) granted during the period.

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The number of shares reserved for issuance under stock option agreements awarded under the plan that validly exist and are outstanding as of the balance sheet date, including vested options.

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The weighted average price as of the beginning of the year at which grantees can acquire the shares reserved for issuance under the stock option plan.

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As of the balance sheet date, the number of shares into which fully vested and expected to vest stock options outstanding can be converted under the option plan.

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As of the balance sheet date, the weighted-average exercise price for outstanding stock options that are fully vested or expected to vest.

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Number of share options (or share units) exercised during the current period.

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