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(1)The decrease in share-based compensation expense in 2019 was primarily driven by the reversal of cumulative compensation expense previously recognized for our 2018 and 2017 PSU awards as the achievement of the performance conditions are no longer deemed probable for the respective performance periods, as well as the impacts of the reversal of expense associated with forfeitures related to the revitalization plan initiated in 2019. Additionally, our share-based compensation expense in 2018 and 2017 also includes expense associated with replacement awards issued in connection with the Acquisition. 

As of December 31, 2019, there was $27.5 million of total unrecognized compensation cost from all share-based compensation arrangements granted under the Incentive Compensation Plan, related to unvested awards. This total compensation expense is expected to be recognized over a weighted-average period of 1.9 years. 

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The weighted-average fair value per unit for the non-vested PSUs is $21.63 as of December 31, 2019. 

The total intrinsic values of RSUs and DSUs vested during 2019, 2018 and 2017 were $23.6 million, $24.8 million and $31.5 million, respectively. 

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The total intrinsic values of exercises during 2019, 2018 and 2017 were $0.6 million, $9.6 million and $7.0 million, respectively. Total tax benefits realized, including excess tax benefits, from share-based awards vested or exercised was $4.5 million, $8.4 million and $20.2 million, respectively. 

The shares of Class B common stock to be issued under the stock option plans are made available from authorized and unissued MCBC Class B common stock. As of December 31, 2019, there were 3.0 million shares of MCBC Class B common stock available for the issuance under the Incentive Compensation Plan. 

