Note 8. Shared-Based Compensation

Share-based compensation expense during the three and six months ended June 30, 2017 and 2016, consisted of the following amounts:


	Three Months Ended				Six Months Ended
	June 30,				June 30,
	2017		2016		2017		2016
Stock options	$	194	$	292	$	575	$	494
Restricted stock		395		710		855		1,358
Performance share units		477		482		788		633

Share-based compensation	$	1,066	$	1,484	$	2,218	$	2,485

Stock Options

During the six months ended June 30, 2017, we granted 125,700 option awards to officers and certain other key employees. The weighted average grant date fair value of options granted during the six months ended June 30, 2017, was $11.84 per share. The fair value of our options cannot be determined by market value, because our options are not traded in an open market. Accordingly, we utilized the Black Scholes financial pricing model to estimate the fair value. The weighted average assumptions relevant to determining the fair value of the 2017 stock option grants are below:


	2017 Stock Option Awards
Term		6 years
Risk free interest rate		2.03	%
Dividend yield		1.16	%
Expected volatility		56.56	%
Expected forfeiture rate		3.00	%

The following table provides a reconciliation of option activity for the six months ended June 30, 2017:


Options	Shares (000)			Weighted- Average Exercise Price (per share)		Weighted- Average Remaining Contractual Term (years)		Aggregate Intrinsic Value
Outstanding at January 1, 2017		897		$	12.22
Granted		126			24.20
Exercised		(220	)		11.81
Forfeited or expired		(6	)		7.72

Outstanding at June 30, 2017		797		$	14.22		6.6	$	10,538	(1)

Exercisable at June 30, 2017		555		$	12.17		5.5	$	8,490	(1)

⁽¹⁾	The intrinsic value is the amount by which the market price of our stock was greater than the exercise price of any individual option grant at June 30, 2017.

Restricted Stock

During the six months ended June 30, 2017, we granted 85,393 restricted stock awards to non-executive directors, officers and certain other key employees. The shares of restricted stock granted during the six months ended June 30, 2017, vest pro-rata over three years for officers and certain other key employees and over one year for non-executive directors. The fair value of the shares issued was determined by using the closing price of our common stock as of the date of grant. The weighted average grant date value of restricted stock granted in the six months ended June 30, 2017, was $24.29 per share.

Performance Share Units

During the six months ended June 30, 2017, we granted 98,618 performance share units to officers and certain other key employees. The performance share units granted will be satisfied in the form of shares of common stock during 2020 if certain performance and/or market conditions are met. We are recognizing the compensation expense over the three-year period in which the performance and market conditions are measured. The fair value per share of the performance share units issued was determined by using the grant date closing price of our common stock for the units with a performance condition, or $24.20, and a Monte Carlo valuation model for the units that have a market condition, or $29.84.