8. STOCK PLANS

Stock Plans Activity

The following table summarizes the restricted stock units (“RSUs”) activity during the three months ended April 1, 2018:


		Weighted
		Average Grant
		Date Fair
	RSUs	Value
Nonvested — December 31, 2017	245,794	$	11.55
Granted	217,530	$	9.10
Vested	(93,994)	$	13.48
Forfeited	(1,560)	$	11.52
Nonvested — April 1, 2018	367,770	$	9.61

The total fair value of the RSUs that vested during the three months ended April 1, 2018, was $0.9 million.

The following table summarizes the stock appreciation rights (“SARs”) activity during the three months ended April 1, 2018:


		Weighted		Aggregate
		Average		Intrinsic Value
	SARs	Exercise Price		(in thousands)
Outstanding December 31, 2017	156,175	$	32.12	$	—
Expired	(2,500)	$	65.31
Outstanding April 1, 2018	153,675	$	31.58	$	—

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 April 1, 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:


	Three Months Ended
	April 1,		March 26,
(in thousands)	2018		2017
Stock-based compensation expense	$	741	$	1,029