	Three Months Ended						Six Months Ended
	June 30,						June 30,
(in thousands)	2019			2018			2019			2018
Performance unit incentive plan (“PUP”)	$	1,557		$	1,324		$	2,980		$	1,518
Restricted stock		783			667			1,476			1,170
Restricted stock units		71			54			161			74
Share-based compensation before income tax benefit		2,411			2,045			4,617			2,762
Income tax benefit		(607	)		(515	)		(1,165	)		(696	)
Share-based compensation, net of income tax benefit	$	1,804		$	1,530		$	3,452		$	2,066

We did not record any share-based compensation expense through restructuring charges during the three and six months ended June 30, 2019 or 2018.

The following table summarizes the activity of the outstanding share-based compensation awards:

	PUP Awards					Restricted Stock					Restricted Stock Units
	Shares			Weighted-Average Grant Date Fair Value		Shares			Weighted-Average Grant Date Fair Value		Shares			Weighted-Average Grant Date Fair Value
Balance at December 31, 2018		239,809		$	40.65		176,769		$	40.87		12,090		$	39.04
Granted		73,020		$	58.25		55,042		$	57.82		5,025		$	56.81
Vested		(95,309	)	$	26.98		(81,320	)	$	31.79		(5,377	)	$	26.98
Forfeited		(488	)	$	54.70		(2,772	)	$	49.24		(115	)	$	52.15
Balance at June 30, 2019		217,032		$	52.54		147,719		$	52.02		11,623		$	52.17

We grant share-based compensation awards to our officers, directors, and certain key employees pursuant to the 2017 Viad Corp Omnibus Incentive Plan (the “2017 Plan”). The 2017 Plan has a 10-year life and provides for the following types of awards: (a) incentive and non-qualified stock options; (b) restricted stock and restricted stock units; (c) performance units or performance shares; (d) stock appreciation rights; (e) cash-based awards; and (f) certain other stock-based awards. In June 2017, we registered 1,750,000 shares of common stock issuable under the 2017 Plan. As of June 30, 2019, there were 1,581,743 shares available for future grant under the 2017 Plan.

The vesting of PUP award shares is based upon achievement of certain performance-based criteria over a three-year period.

During the six months ended June 30, 2019, we granted PUP awards with a grant date fair value of $4.3 million of which $1.7 million are payable in shares. Liabilities related to PUP awards were $4.2 million as of June 30, 2019 and $7.0 million as of December 31, 2018. In 2019, PUP awards granted in 2016 vested and we paid $5.6 million in cash and $3.4 million in shares. In 2019, we withheld 25,771 shares for $1.5 million related to tax withholding requirements on vested PUP awards paid in shares. In 2018, PUP awards granted in 2015 vested and we distributed cash payouts of $5.9 million.

As of June 30, 2019, the unamortized cost of outstanding restricted stock awards was $4.1 million, which we expect to recognize over a weighted-average period of approximately 1.5 years. We repurchased 24,217 shares for $1.4 million during the six months ended June 30, 2019 and 19,237 shares for $1.0 million during the six months ended June 30, 2018 related to tax withholding requirements on vested share-based awards.

Aggregate liabilities related to restricted stock units were $0.3 million as of June 30, 2019 and $0.4 million as of December 31, 2018. During the six months ended June 30, 2019, restricted stock units vested and we paid $0.3 million in cash and $0.2 million in shares. During the six months ended June 30, 2018, the 2015 restricted stock units vested and we distributed $0.2 million in cash payouts.

	Shares			Weighted-Average Exercise Price
Options outstanding and exercisable at December 31, 2018		58,689		$	16.62
Exercised		(5,546	)	$	16.62
Options outstanding and exercisable at June 30, 2019		53,143		$	16.62