8. STOCK PLANS

Stock Plans Activity

The following table summarizes the restricted stock units (“RSUs”) activity during the nine months ended September 30, 2018:


		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

The total fair value of the RSUs that vested during the nine months ended September 30, 2018, was $1.5 million.

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	$	—

Stock-Based Compensation

All stock-based payments, including grants of stock appreciation rights, restricted stock units and common stock under equity incentive plans, are recognized in the financial statements based on their grant date fair values. As of September 30, 2018, we had two stock-based compensation plans. Stock-based compensation expenses are reported in the compensation line item in the condensed consolidated statements of operations. Total stock-based compensation expense for the periods presented in this report, are as follows:


	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