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Share-Based Compensation Plans (Tables) | 12 Months Ended
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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.
| 2019 |  | 2018 |  | 2017
Weighted-average risk-free interest rate | 1.69 | % |  | 2.87 | % |  | 2.35 | %
Expected dividend yield | — | % |  | — | % |  | — | %
Weighted-average expected volatility | 29.92 | % |  | 25.47 | % |  | 25.05 | %
Weighted-average expected life (in years) | 7.00 |  | 7.00 |  | 7.00
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, 2018 | 2,520,526 |  |  | $ | 22.13 |  |  |  |  |
Granted | 577,230 |  |  | 19.05 |  |  |  |  |
Exercised | (82,500) |  |  | 16.79 |  |  |  |  | $ | 341 |
Expired | (90,000) |  |  | 25.19 |  |  |  |  |
Forfeited | (95,008) |  |  | 21.19 |  |  |  |  |
Outstanding, December 31, 2019 | 2,830,248 |  |  | $ | 21.59 |  |  | 6.45 |  | $ | 9,212 |
Exercisable at December 31, 2019 | 766,739 |  |  | $ | 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, 2018 | 1,671,223 |  |  | $ | 25.10 |
Granted | 577,230 |  |  | 19.05 |
Vested | (89,936) |  |  | 19.33 |
Forfeited | (95,008) |  |  | 21.19 |
Non-vested at December 31, 2019 | 2,063,509 |  |  | 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, 2018 | 884,659 |  |  | $ | 23.99 |
Granted | 177,627 |  |  | 20.27 |
Vested | (281,905) |  |  | 23.22 |
Forfeited | (62,700) |  |  | 23.25 |
Outstanding and unvested at December 31, 2019 | 717,681 |  |  | 23.43 |

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- Definition Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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