Stock Plans	9 Months Ended
Sep. 30, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Stock Plans	9. STOCK PLANS: During the nine months ended September 30, 2018, the Company granted 0.1 million restricted stock units with a weighted-average grant date fair value of $71.91 per award. There were 0.3 million and 0.4 million restricted stock units outstanding at September 30, 2018 and December 31, 2017, respectively. The compensation expense that has been charged against pre-tax income for all of the Company’s stock-based compensation plans was $1.9 million and $1.7 million for the three months ended September 30, 2018 and 2017, respectively, and $5.8 million and $5.0 million for the nine months ended September 30, 2018 and 2017, respectively.

Stock Plans

9 Months Ended

Sep. 30, 2018

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

9. STOCK PLANS:

During the nine months ended September 30, 2018, the Company granted 0.1 million restricted stock units with a weighted-average grant date fair value of $71.91 per award. There were 0.3 million and 0.4 million restricted stock units outstanding at September 30, 2018 and December 31, 2017, respectively.

The compensation expense that has been charged against pre-tax income for all of the Company’s stock-based compensation plans was $1.9 million and $1.7 million for the three months ended September 30, 2018 and 2017, respectively, and $5.8 million and $5.0 million for the nine months ended September 30, 2018 and 2017, respectively.