	Three Months Ended
	March 31,
(in thousands)	2020			2019
Performance unit incentive plan (“PUP”)⁽¹⁾	$	(2,635	)	$	1,423
Restricted stock		650			693
Restricted stock units		(160	)		90
Share-based compensation (income) expense before income tax benefit		(2,145	)		2,206
Income tax benefit		(109	)		(558	)
Share-based compensation (income) expense, net of income tax benefit	$	(2,254	)	$	1,648

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, 2019		214,904		$	52.53		136,123		$	52.66		11,623		$	52.17
Granted		84,898		$	56.15		47,742		$	55.91		3,391		$	55.24
Vested		(67,866	)	$	47.43		(61,475	)	$	50.02		(2,815	)	$	47.45
Forfeited		(595	)	$	58.79		(1,494	)	$	54.39		(760	)	$	56.88
Balance at March 31, 2020		231,341		$	55.34		120,896		$	55.26		11,439		$	53.93

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 term 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 March 31, 2020, there were 1,505,330 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 three months ended March 31, 2020, we granted PUP awards with a grant date fair value of $4.8 million of which $1.8 million are payable in shares. Liabilities related to PUP awards were $0.4 million as of March 31, 2020 and $5.3 million as of December 31, 2019. In 2020, PUP awards granted in 2017 vested and we paid $2.6 million in cash. No PUP awards were paid in shares in 2020. 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.

As of March 31, 2020, the unamortized cost of outstanding restricted stock awards was $4.4 million, which we expect to recognize over a weighted-average period of approximately 1.8 years. We repurchased 17,674 shares for $1.1 million during the three months ended March 31, 2020 and 24,067 shares for $1.4 million during the three months ended March 31, 2019 related to tax withholding requirements on vested share-based awards.

Aggregate liabilities related to restricted stock units were $0.1 million as of March 31, 2020 and $0.4 million as of December 31, 2019. During the three months ended March 31, 2020, restricted stock units vested and we paid $0.2 million in cash. During the three months ended March 31, 2019, restricted stock units vested and we paid $0.3 million in cash.

	Shares			Weighted-Average Exercise Price
Options outstanding and exercisable at December 31, 2019		41,143		$	16.62
Exercised		(41,143	)	$	16.62
Options outstanding and exercisable at March 31, 2020		—		$	—