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Share-Based Compensation Plans (Tables)
 12 Months Ended
Dec. 31, 2019
Share-based Payment Arrangement [Abstract]  
Statement of Weighted-Average Assumptions Used and Resulting Weighted-Average Fair Value of Option
The following table presents the weighted-average assumptions used and the resulting weighted-average fair value of each option granted for the periods presented.
201920182017
Weighted-average risk-free interest rate1.69 %2.87 %2.35 %
Expected dividend yield— %— %— %
Weighted-average expected volatility29.92 %25.47 %25.05 %
Weighted-average expected life (in years)7.007.007.00
Weighted-average fair value of each option granted$5.56  $10.05  $8.68  
Summary of Stock Option Activity
The following table summarizes stock option activity for the year ended December 31, 2019:
Number
of Shares
Weighted-
Average
Exercise
Price
Weighted-
Average
Remaining
Contractual
Term
in Years
Aggregate
Intrinsic
Value
(dollars in thousands, except weighted-average exercise price)
Outstanding, December 31, 20182,520,526  $22.13  
Granted577,230  19.05  
Exercised(82,500) 16.79  $341  
Expired(90,000) 25.19  
Forfeited(95,008) 21.19  
Outstanding, December 31, 20192,830,248  $21.59  6.45$9,212  
Exercisable at December 31, 2019766,739  $15.52  3.46$6,390  
Summary of Non-Vested Options
A summary of the status of Customers' non-vested options at December 31, 2019, and changes during the year ended December 31, 2019 was as follows:
Options
Weighted-
Average
exercise price
Non-vested at December 31, 20181,671,223  $25.10  
Granted577,230  19.05  
Vested(89,936) 19.33  
Forfeited(95,008) 21.19  
Non-vested at December 31, 20192,063,509  23.85  
Status of Restricted Stock
The table below presents the status of the restricted stock units at December 31, 2019, and changes during the year ended December 31, 2019:
Restricted
Stock Units
Weighted-
Average Grant-
Date Fair Value
Outstanding and unvested at December 31, 2018884,659  $23.99  
Granted177,627  20.27  
Vested(281,905) 23.22  
Forfeited(62,700) 23.25  
Outstanding and unvested at December 31, 2019717,681  23.43