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Share-Based Compensation Plans (Tables) | 12 Months Ended
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Dec. 31, 2020
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 years ended December 31, 2019 and 2018.
|  |  | 2019 |  | 2018
Weighted-average risk-free interest rate |  |  | 1.69 | % |  | 2.87 | %
Expected dividend yield |  |  | — | % |  | — | %
Weighted-average expected volatility |  |  | 29.92 | % |  | 25.47 | %
Weighted-average expected life (in years) |  |  | 7.00 |  | 7.00
Weighted-average fair value of each option granted |  |  | $ | 5.56 |  |  | $ | 10.05 |
Summary of Stock Option Activity | The following table summarizes stock option activity for the year ended December 31, 2020:
| Number of Options |  | 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, 2019 | 2,830,248 |  |  | $ | 21.59 |  |  |  |  | $ | 9 |
Granted | — |  |  | — |  |  |  |  | — |
Exercised | (12,834) |  |  | 10.32 |  |  |  |  | 74 |
Expired | (1,834) |  |  | 9.54 |  |  |  |  | 4 |
Forfeited | (509,241) |  |  | 23.16 |  |  |  |  | — |
Outstanding, December 31, 2020 | 2,306,339 |  |  | $ | 21.32 |  |  | 4.86 |  | $ | 2,059 |
Exercisable at December 31, 2020 | 907,045 |  |  | $ | 16.35 |  |  | 2.97 |  | $ | 2,059 |
Summary of Non-Vested Options | A summary of the status of Customers' non-vested options at December 31, 2020, and changes during the year ended December 31, 2020 was as follows:
| Options |  | Weighted- Average exercise price
Non-vested at December 31, 2019 | 2,063,509 |  |  | $ | 23.85 |
Granted | — |  |  | — |
Vested | (405,751) |  |  | 21.93 |
Forfeited | (258,464) |  |  | 23.12 |
Non-vested at December 31, 2020 | 1,399,294 |  |  | 24.55 |
Status of Restricted Stock | The table below presents the status of the restricted stock units at December 31, 2020, and changes during the year ended December 31, 2020:
| Restricted Stock Units |  | Weighted- Average Grant- Date Fair Value
Outstanding and unvested at December 31, 2019 | 717,681 |  |  | $ | 23.43 |
Granted | 903,581 |  |  | 18.99 |
Vested | (363,647) |  |  | 22.99 |
Forfeited | (23,702) |  |  | 21.87 |
Outstanding and unvested at December 31, 2020 | 1,233,913 |  |  | 20.35 |

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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=120381028&loc=d3e5070-113901 + Details
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