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Share-Based Compensation Plans (Tables) | 12 Months Ended
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Dec. 31, 2017
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.
| 2017 |  | 2016 |  | 2015
Weighted-average risk-free interest rate | 2.35 | % |  | 1.84 | % |  | 1.90 | %
Expected dividend yield | — | % |  | — | % |  | — | %
Weighted-average expected volatility | 25.05 | % |  | 23.39 | % |  | 21.18 | %
Weighted-average expected life (in years) | 7.00 |  |  | 7.00 |  |  | 7.00 |
Weighted-average fair value of each option granted | $ | 8.68 |  |  | $ | 7.61 |  |  | $ | 6.42 |
Summary of Stock Option Activity | The following table summarizes stock option activity for the year ended December 31, 2017:
| 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, 2016 | 3,960,040 |  |  | $ | 15.25 |  |  |  |  |
Granted | 776,500 |  |  | 26.92 |  |  |  |  |
Exercised | (2,007,762 | ) |  | 11.30 |  |  |  |  | $ | 32,029 |
Expired | (7,334 | ) |  | 10.91 |  |  |  |  |
Forfeited | (2,750 | ) |  | 17.65 |  |  |  |  |
Outstanding, December 31, 2017 | 2,718,694 |  |  | $ | 21.52 |  |  | 7.54 |  | $ | 12,887 |
Exercisable at December 31, 2017 | 96,963 |  |  | $ | 12.42 |  |  | 4.06 |  | $ | 1,317 |
Summary of Non-Vested Options | A summary of the status of Customers' non-vested options at December 31, 2017, and changes during the year ended December 31, 2017, is as follows:
| Options |  | Weighted- Average exercise price
Non-vested at December 31, 2016 | 2,865,962 |  |  | $ | 17.24 |
Granted | 776,500 |  |  | 26.92 |
Vested | (1,017,981 | ) |  | 12.77 |
Forfeited | (2,750 | ) |  | 17.65 |
Non-vested at December 31, 2017 | 2,621,731 |  |  | 21.85 |
Status of Restricted Stock | The table below presents the status of the restricted stock units at December 31, 2017, and changes during the year ended December 31, 2017:
| Restricted Stock Units |  | Weighted- Average Grant- Date Fair Value
Outstanding and unvested at December 31, 2016 | 645,505 |  |  | $ | 19.43 |
Granted | 218,449 |  |  | 29.93 |
Vested | (256,078 | ) |  | 15.70 |
Forfeited | (17,840 | ) |  | 25.85 |
Outstanding and unvested at December 31, 2017 | 590,036 |  |  | $ | 24.74 |

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- Definition Tabular disclosure of the number and weighted-average grant date fair value for restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock units that were granted, vested, or forfeited during the year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=96867065&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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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