Stock-Based Compensation (Tables)

6 Months Ended

Jul. 01, 2017

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Schedule of stock-based compensation expense under all share-based payment plans [Table Text Block]

Stock-based compensation expense under all share-based payment plans -- our Employee Stock Purchase Plan, stock option plans, stock-settled stock appreciation rights and restricted stock units -- included in the results of operations follows:

	Three months ended				Six Months Ended
	July 1, 2017		July 2, 2016		July 1, 2017		July 2, 2016
Compensation expense, all share-based payment plans	$	1,462	$	678	$	2,448	$	1,324

Schedule of share-based compensation, stock-settled stock appreciation rights award activity [Table Text Block]

The following table summarizes our SSARs as of July 1, 2017.

Stock-Settled Stock Appreciation Rights	Number of Rights		Weighted- Average Award Date Value		Weighted- Average Remaining Contractual Life	Unrecognized Compensation Cost		Aggregate Intrinsic Value
Unvested, January 1, 2017	743,662		$	2.75
Granted	152,000		3.57
Forfeited	—		—
Vested	(240,546	)	2.59
Unvested, July 1, 2017	655,116		$	3.00	2.7 years	$	1,301	$	11,530
Employee SSARs	655,116		$	3.00	2.7 years	$	1,301	$	11,530

Schedule of share-based compensation, performance-based restricted stock units award activity [Table Text Block]

The following table summarizes restricted stock units as of July 1, 2017.

Restricted Stock Units	Number of Stock Units		Weighted- Average Grant Date Value		Weighted- Average Remaining Contractual Life	Unrecognized Compensation Cost		Aggregate Intrinsic Value
Unvested, January 1, 2017	304,958		$	13.22
Granted	80,350		17.01
Forfeited	—		—
Vested	(49,964	)	11.38
Unvested, July 1, 2017	335,344		$	14.40	2.8 years	$	2,604	$	5,902

Schedule of share-based payment award, stock options, valuation assumptions [Table Text Block]

The fair values of stock-based awards granted were estimated at the dates of grant with the following weighted-average assumption.

	Six Months Ended
	July 1, 2017		July 2, 2016
Volatility rate	10.3	%	10.6	%
Risk-free interest rate	2.2	%	1.8	%
Expected dividend yield	.7	%	.7	%
Expected life of awards (years)	8.9		9.5

Schedule of share-based compensation, stock options activity [Table Text Block]

The following table summarizes activity under the stock option plans for the six months endedJuly 1, 2017.

Stock Options	Number of Options Outstanding		Weighted- Average Exercise Price		Weighted- Average Remaining Contractual Life	Aggregate Intrinsic Value
Outstanding, January 1, 2017	1,599,296		$	12.49
Granted	148,500		17.60
Exercised	(74,420	)	10.40
Forfeited	(64,574	)	12.75
Outstanding, July 1, 2017	1,608,802		$	13.05	6.7 years	$	7,320
Exercisable, July 1, 2017	869,302		$	11.23	5.4 years	$	5,537