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Stock-Based Compensation
6 Months Ended
Jun. 30, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Stock-Based Compensation
Stock-Based Compensation
Aggregate stock-based compensation expense for the three and six months ended June 30, 2018 was $2.1 million and $5.6 million, respectively, net of a Divestiture-related forfeiture benefit of $1.9 million that was recognized when employees conveyed to the Buyer upon closing. Stock-based compensation expense was $5.3 million and $9.7 million in the three and six months ended June 30, 2017, respectively.
Stock-based compensation expense related to stock options in the three and six months ended June 30, 2018 was $1.0 million and $1.5 million, respectively, net of $0.4 million of Divestiture-related forfeitures. Stock-based compensation expense from stock options was $2.3 million and $3.4 million in the three and six months ended June 30, 2017, respectively.
Expense related to time-based restricted share units in the three and six months ended June 30, 2018 was $0.2 million and $2.1 million, respectively, net of $0.9 million of Divestiture-related forfeitures. Expense from time-based restricted share units was $0.9 million and $3.1 million in the three and six months ended June 30, 2017, respectively.
Stock-based compensation expense related to performance-based restricted share units in the three and six months ended June 30, 2018 was $0.9 million and $1.9 million, respectively, net of $0.6 million of Divestiture-related forfeitures. Expense from performance-based restricted share units was $2.1 million and $3.2 million in the three and six months ended June 30, 2017, respectively.
The stock-based compensation expense amounts above include amounts allocated to discontinued operations. Most of the Divestiture-related benefit is included in discontinued operations. Accordingly, stock-based compensation expense allocated to discontinued operations was a net benefit of $1.7 million and $1.5 million, respectively, the three and six months ended June 30, 2018. Stock-based compensation expense allocated to discontinued operations was $0.4 million and $0.8 million in the three and six months ended June 30, 2017, respectively.