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Equity Based Compensation
 9 Months Ended
Sep. 30, 2018
Share-based Payment Arrangement [Abstract]  
Share-based Payment Arrangement, Option, Activity [Table Text Block]
Option Awards
A summary of activity related to stock option awards for the nine months ended September 30, 2019 and 2018 follows:
 
Number of
Option
Awards
 
Weighted
Average
Exercise Price
Option awards outstanding, December 31, 2018
964,840

 
$
26.53

Exercised
(26,043
)
 
20.63

Canceled or forfeited
(1,960
)
 
63.74

Option awards outstanding and exercisable, September 30, 2019
936,837

 
$
26.62

 


 


Option awards outstanding, December 31, 2017
1,270,688

 
$
26.93

Exercised
(291,689
)
 
26.49

Option awards outstanding, September 30, 2018
978,999

 
$
27.07


The intrinsic value of options exercised was $0.4 million and $4.6 million, respectively, during the nine months ended September 30, 2019 and 2018. The related tax benefit of options exercised was not significant for the nine months ended September 30, 2019 and was $1.1 million for the nine months ended September 30, 2018.