Share-based Compensation (Details 3) (USD $)	3 Months Ended
Mar. 31, 2015	Apr. 01, 2014
Options
Shares
Outstanding at the beginning of the period (in shares)	636,930
Exercised (in shares)	(105,308)
Outstanding at the end of the period (in shares)	531,622
Exercisable at the end of period (in shares)	531,622
Stock options vested (in shares)	0	0
Weighted-Average Exercise Price
Outstanding at the beginning of the period (in dollars per share)	$ 14.20
Exercised (in dollars per share)	$ 15.12
Outstanding at the end of the period (in dollars per share)	$ 14.01
Exercisable at the end of the period (in dollars per share)	$ 14.01
Weighted-Average Remaining Contractual Term
Outstanding at the end of the period	1 year 8 months 9 days
Exercisable at the end of the period	1 year 8 months 9 days
Aggregate Intrinsic Value
Outstanding at the end of the period (in dollars)	$ 11,917,000
Exercisable at the end of the period (in dollars)	11,917,000
Intrinsic value of options exercised (in dollars)	2,200,000	1,500,000
PSUs
Share-based compensation
Number of executives to whom the stock awards are granted	2
Vesting period	1 year
Granted (in shares)	115,000
Granted (in dollars per share)	$ 34.77
Unrecognized compensation cost of unvested stock awards (in dollars)	$ 3,100,000
Expected weighted-average period of recognition of unrecognized compensation cost of unvested awards	9 months 18 days

Represents the number of executives to whom the stock awards are granted.

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Unrecognized cost of unvested share-based compensation awards.

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-Name Accounting Standards Codification

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Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

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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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Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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Number of options outstanding, including both vested and non-vested options.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Number of options vested.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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

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