STOCK PLANS (Tables)

9 Months Ended

Sep. 30, 2018

STOCK PLANS

Summary of the restricted stock units ("RSUs") activity

		Weighted
		Average Grant
		Date Fair
	RSUs	Value
Nonvested — December 31, 2017	245,794	$	11.55
Granted	268,080	$	8.95
Vested	(164,442)	$	11.41
Forfeited	(4,530)	$	10.75
Nonvested — September 30, 2018	344,902	$	9.60

Summary of the stock appreciation rights ("SARs") activity

The following table summarizes the stock appreciation rights (“SARs”) activity during the nine months ended September 30, 2018: 

		Weighted		Aggregate
		Average		Intrinsic Value
	SARs	Exercise Price		(in thousands)
Outstanding December 31, 2017	156,175	$	32.12	$	—
Expired	(31,225)	$	36.87
Outstanding September 30, 2018	124,950	$	30.93	$	—

Summary of stock-based compensation expense

	Quarters Ended				Nine Months Ended
	September 30,		September 24,		September 30,		September 24,
(in thousands)	2018		2017		2018		2017
Stock-based compensation expense	$	758	$	325	$	1,819	$	1,786