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Employee stock purchase plan, cumulative shares purchased

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Employee stock purchase plan, weighted average purchase price of shares purchased

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Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Aggregate Intrinsic Value

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Share-based compensation arrangement by share-based payment award, number of employees participating

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Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Unrecognized Compensation Cost

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No definition available.

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Share-based Compensation Arrangement by Share-based Payment Award, Percentage of Market Price, Purchase Date

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No definition available.

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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.

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Unrecognized cost of unvested share-based compensation awards.

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The total recognized tax benefit related to compensation cost for equity-based payment arrangements recognized in income during the period.

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The aggregate cash inflow comprised of the amount received from (a) employees to acquire the entity's shares under incentive awards, including stock option exercises and restricted stock arrangements, and (b) the excess tax benefit arising from such transactions.

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Estimated period over which an employee is required to provide service in exchange for the equity-based payment award, 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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Discount rate from fair value on purchase date that participants pay for shares.

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Intrinsic value of equity-based compensation awards not vested. Excludes stock and unit options.

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The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

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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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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units.

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Weighted average remaining contractual term for equity-based awards excluding options, 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 equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

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Expected term of share-based compensation awards, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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-Name Staff Accounting Bulletin (SAB)

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The risk-free interest rate assumption that is used in valuing an option on its own shares.

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Weighted average expected volatility rate of share-based compensation awards.

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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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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.

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

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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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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of fully vested and expected to vest options that are exercisable.

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Stock-Based Compensation (Details) (USD $) In Thousands, except Share data, unless otherwise specified	9 Months Ended	12 Months Ended
	Sep. 27, 2014	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Percentage of Outstanding Stock Maximum	10.00%	5.00%
Salaries, Wages and Officers' Compensation [Abstract]
Compensation expense, all share-based payment plans		$ 1,860	$ 1,411	$ 1,508
Income tax benefit		549	348	383
Employee Stock Purchase Plan [Abstract]
Shares purchased during the year		115,029
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]
Volatility rate		11.20%	11.30%	11.70%
Risk-free interest rate		2.60%	2.10%	1.60%
Expected dividend yield		1.10%	1.50%	1.50%
Expected life of awards (years)		9 years 4 months 24 days	9 years 4 months 24 days	9 years 1 month 6 days
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Outstanding, beginning balance	662,246	662,246
Granted, Stock Options		183,500
Exercised		(74,715)
Forfeited		900
Outstanding, ending balance		770,131	662,246
Exercisable, ending balance		388,851
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price		$ 14.70
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Granted, weighted average exercise price		$ 26.40
Exercised, weighted average exercise price		$ 13.11
Forfeited, weighted average exercise price		$ 24.98
Outstanding, weighted average exercise price, ending balance		$ 19.33	$ 16.68
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term		6 years 3 months 4 days
Exercisable, weighted average remaining contractual life (years)		3 years 10 months 13 days
Outstanding, unrecognized compensation cost		1,509
Outstanding, aggregate intrinsic value		6,523
Exercisable, aggregate intrinisic value		5,094
Proceeds and Excess Tax Benefit from Share-based Compensation		354	242	402
Employee Stock Purchase Plan [Member]
Employee Stock Purchase Plan [Abstract]
Employee stock purchase, discount from market price, purchase date		15.00%
Number of employees participating		1,684	1,500	1,157
Shares purchased during the year		115,029	118,444	136,947
Weighted-average per share purchase price paid		$ 23.07	$ 20.01	$ 17.20
Cumulative shares purchased since 1982		8,751,255	8,636,226	8,517,782
Employee Stock Purchase Plan [Member]
Salaries, Wages and Officers' Compensation [Abstract]
Compensation expense, all share-based payment plans		463	417	415
Employee Stock Purchase Plan [Abstract]
Employee stock purchase plan, service period		1 year
Employee stock purchase plan, percentage of market price, purchase date		85.00%
Employee stock purchase, discount from market price, purchase date		15.00%
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation, vesting period		10 years
Salaries, Wages and Officers' Compensation [Abstract]
Compensation expense, all share-based payment plans		398	234	166
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Number outstanding		770,131
Weighted average remaining contractual life (years)			6 years 3 months 4 days
Outstanding options, weighted average exercise price		$ 19.33
Number exercisable		388,851
Exercisable options, weighted average exercise price		$ 14.70
Stock Options [Member] \| $11.25 [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Lower range limit		$ 11.25
Upper range limit		$ 11.25
Number outstanding		170,047
Weighted average remaining contractual life (years)			1 year 5 months 5 days
Outstanding options, weighted average exercise price		$ 11.25
Number exercisable		170,047
Exercisable options, weighted average exercise price		$ 11.25
Stock Options [Member] \| $16.00 [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Lower range limit		$ 16.00
Upper range limit		$ 16.0
Number outstanding		113,234
Weighted average remaining contractual life (years)			4 years 10 months 2 days
Outstanding options, weighted average exercise price		$ 16.00
Number exercisable		113,234
Exercisable options, weighted average exercise price		$ 16.00
Stock Options [Member] \| $16.60 [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Lower range limit		$ 16.60
Upper range limit		$ 16.60
Number outstanding		108,900
Weighted average remaining contractual life (years)			5 years 10 months 2 days
Outstanding options, weighted average exercise price		$ 16.60
Number exercisable		69,420
Exercisable options, weighted average exercise price		$ 16.60
Stock Options [Member] \| $23.20 [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Lower range limit		$ 23.20
Upper range limit		$ 23.20
Number outstanding		194,950
Weighted average remaining contractual life (years)			8 years 5 months 23 days
Outstanding options, weighted average exercise price		$ 23.20
Number exercisable		36,150
Exercisable options, weighted average exercise price		$ 23.20
Stock Options [Member] \| $ 16.40 [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Number outstanding		183,000
Weighted average remaining contractual life (years)			9 years 6 months
Number exercisable		0
Exercisable options, weighted average exercise price		$ 26.40
Stock Appreciation Rights (SARs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation, vesting period		5 years
Salaries, Wages and Officers' Compensation [Abstract]
Compensation expense, all share-based payment plans		384	315	185
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Unvested, beginning balance	283,453	283,453
Granted		127,050
Forfeited		0
Vested		(107,232)
Unvested, ending balance		303,271	283,453
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures [Abstract]
Unvested, weighted average award date value, beginning balance	$ 3.15	$ 3.15
Granted, weighted average award date value		$ 4.88
Forfeited, weighted average award date value		$ 0.00
Vested, weighted average award date value		$ 3.26
Unvested, weighted average award date value, ending balance		$ 3.84	$ 3.15
Weighted average remaining contractual life (years)		2 years
Unrecognized compensation cost		865
Aggregate intrinsic value		8,431
Employee SSARs [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Unvested, ending balance		286,294
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures [Abstract]
Unvested, weighted average award date value, ending balance		$ 3.92
Weighted average remaining contractual life (years)		2 years
Unrecognized compensation cost		838
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Nonvested		7,959
Nonemployee Director SSARs [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Unvested, ending balance		16,977
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures [Abstract]
Unvested, weighted average award date value, ending balance		$ 2.29
Weighted average remaining contractual life (years)		1 year 9 months 18 days
Unrecognized compensation cost		27
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Nonvested		472
Restricted Stock Units (RSUs) [Member]
Salaries, Wages and Officers' Compensation [Abstract]
Compensation expense, all share-based payment plans		615	445	644
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Unvested, beginning balance	95,558	95,558
Granted		39,476
Forfeited		0
Vested		(17,325)
Unvested, ending balance		117,709	95,558
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures [Abstract]
Unvested, weighted average award date value, beginning balance	$ 19.03	$ 19.03
Granted, weighted average award date value		$ 24.64
Forfeited, weighted average award date value		$ 0.00
Vested, weighted average award date value		$ 17.48
Unvested, weighted average award date value, ending balance		$ 21.14	$ 19.03
Weighted average remaining contractual life (years)		2 years 7 months 28 days
Unrecognized compensation cost		1,456
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Nonvested		3,272
Employee PRSUs [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Unvested, ending balance		103,139
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures [Abstract]
Unvested, weighted average award date value, ending balance		$ 20.78
Weighted average remaining contractual life (years)		2 years 10 months 24 days
Unrecognized compensation cost		1,236
Aggregate intrinsic value		2,867
Nonemployee Director PRSUs [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Unvested, ending balance		14,570
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures [Abstract]
Unvested, weighted average award date value, ending balance		$ 23.61
Weighted average remaining contractual life (years)		1 year 9 months 18 days
Unrecognized compensation cost		220
Aggregate intrinsic value		$ 405
Director Stock Option [Member] \| $ 16.40 [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Lower range limit		$ 16.4
Upper range limit		$ 16.4