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Share-Based Compensation Plans (Tables) | 12 Months Ended
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Dec. 31, 2018
Disclosure of Compensation Related Costs, Share-based Payments [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.
| 2018 |  | 2017 |  | 2016
Weighted-average risk-free interest rate | 2.87 | % |  | 2.35 | % |  | 1.84 | %
Expected dividend yield | — | % |  | — | % |  | — | %
Weighted-average expected volatility | 25.47 | % |  | 25.05 | % |  | 23.39 | %
Weighted-average expected life (in years) | 7.00 |  |  | 7.00 |  |  | 7.00 |
Weighted-average fair value of each option granted | $ | 10.05 |  |  | $ | 8.68 |  |  | $ | 7.61 |
Summary of Stock Option Activity | The following table summarizes stock option activity for the year ended December 31, 2018:
| 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, 2017 | 2,718,694 |  |  | $ | 21.52 |  |  |  |  |
Granted | 10,000 |  |  | 29.48 |  |  |  |  |
Exercised | (197,918 | ) |  | 14.06 |  |  |  |  | $ | 3,123 |
Forfeited | (10,250 | ) |  | 21.96 |  |  |  |  |
Outstanding, December 31, 2018 | 2,520,526 |  |  | $ | 22.13 |  |  | 6.40 |  | $ | 2,311 |
Exercisable at December 31, 2018 | 849,303 |  |  | $ | 16.29 |  |  | 3.68 |  | $ | 2,276 |
Summary of Non-Vested Options | A summary of the status of Customers' non-vested options at December 31, 2018, and changes during the year ended December 31, 2018, is as follows:
| Options |  | Weighted- Average exercise price
Non-vested at December 31, 2017 | 2,621,731 |  |  | $ | 21.85 |
Granted | 10,000 |  |  | 29.48 |
Vested | (950,258 | ) |  | 16.22 |
Forfeited | (10,250 | ) |  | 21.96 |
Non-vested at December 31, 2018 | 1,671,223 |  |  | 25.10 |
Status of Restricted Stock | The table below presents the status of the restricted stock units at December 31, 2018, and changes during the year ended December 31, 2018:
| Restricted Stock Units |  | Weighted- Average Grant- Date Fair Value
Outstanding and unvested at December 31, 2017 | 590,036 |  |  | $ | 24.74 |
Granted | 433,614 |  |  | 23.63 |
Vested | (97,414 | ) |  | 25.66 |
Forfeited | (41,577 | ) |  | 27.05 |
Outstanding and unvested at December 31, 2018 | 884,659 |  |  | 23.99 |

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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=109197908&loc=d3e5070-113901 + Details
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