Stock-Based Compensation (Tables)

6 Months Ended

Jun. 30, 2018

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

Summary of Stock Option Activity

Stock option activity in the first half of 2018 is summarized in the following table:

	Outstanding			Weighted Average Exercise Price		Remaining Contractual Life in Years		Aggregate Intrinsic Value
Balance at December 31, 2017		145,625		$	18.96		2.0	$	—
Granted		—		$
Exercised		(4,500	)	$	15.17
Canceled		(55,125	)	$	18.53
Expired		(27,000	)	$	21.84
Balance at June 30, 2018		59,000		$	18.33
Options vested or expected to vest at June 30, 2018		59,000		$	18.33		2.8	$	58,433
Exercisable at June 30, 2018		59,000

Summary of Restricted Stock Unit Activity

Restricted stock unit activity in the first half of 2018 is summarized in the following table:

	Number of Awards			Weighted Average Grant Date Fair Value		Weighted Average Remaining Amortization Period (in Years)
Balance at December 31, 2017		169,266		$	22.27		1.6
Granted		185,071		$	15.60
Vested		(58,580	)	$	22.93
Canceled		(389	)	$	15.91
Balance at June 30, 2018		295,368		$	17.96		2.0

Summary of Restricted Performance Stock Unit Activity

Restricted performance stock unit activity in the first half of 2018 is summarized in the following table:

	Number of Awards			Weighted Average Grant Date Fair Value		Weighted Average Remaining Amortization Period (in Years)
Balance at December 31, 2017		239,674		$	22.58		1.7
Granted		287,662		$	16.84
Vested		—		$	—
Canceled		(778	)	$	16.85
Balance at June 30, 2018		526,558		$	19.45		2.4

Summary of Stock-based Compensation Expense

Stock-based compensation expense related to our equity incentive plans was allocated as follows:

	Three Months Ended						Six Months Ended
	June 30, 2018			June 25, 2017			June 30, 2018			June 25, 2017
(Dollars in thousands)
Cost of sales	$	230		$	(138	)	$	411		$	49
Selling, general and administrative expenses		750			(154	)		1,302			938
Stock-based compensation expense before income taxes		980			(292	)		1,713			987
Income tax benefit (expense)		(229	)		108			(400	)		(364	)
Total stock-based compensation expense after income taxes	$	751		$	(184	)	$	1,313		$	623