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Share-Based Compensation and Benefit Plans (Tables) | 3 Months Ended
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Mar. 31, 2019
Restricted stock [Member] |
Share-Based Compensation and Benefit Plans |
Summary of activity of share-based compensation |
| For the Three Months Ended March 31,
| 2019 |  | 2018
Compensation expense for shares issued under the ESPP | $ | 577 |  |  | $ | 543 |
Income tax benefit from compensation expense related to shares issued under the ESPP | 142 |  |  | 136 |
Compensation expense for restricted shares awarded | 339 |  |  | 341 |
Income tax benefit from compensation expense related to restricted awards | $ | 84 |  |  | $ | 86 |
Stock option [Member] |
Share-Based Compensation and Benefit Plans |
Summary of stock options |
| Shares |  | Weighted-Average Exercise Price
Outstanding at December 31, 2018 | 1,860 |  |  | $ | 178.57 |
Granted | 136 |  |  | 355.99 |
Exercised | (133 | ) |  | 89.66 |
Forfeited | (10 | ) |  | 250.31 |
Outstanding at March 31, 2019 | 1,853 |  |  | $ | 197.62 |
Exercisable at March 31, 2019 | 1,215 |  |  | $ | 154.27 |
Black-Scholes option pricing model |
| For the Three Months Ended March 31,
| 2019 |  | 2018
Risk free interest rate | 2.50 | % |  | 2.58 | %
Expected life | 6.2 Years |  |  | 6.3 Years |
Expected volatility | 25.0 | % |  | 23.7 | %
Expected dividend yield | — | % |  | — | %
Summary of activity of share-based compensation |
| For the Three Months Ended March 31,
| 2019 |  | 2018
Compensation expense for stock options awarded | $ | 4,508 |  |  | $ | 4,292 |
Income tax benefit from compensation expense related to stock options | 1,112 |  |  | 1,078 |
Weighted-average grant-date fair value of options awarded | $ | 108.74 |  |  | $ | 75.42 |

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- Definition Tabular disclosure of components of a stock option or other award plan under which equity-based compensation is awarded to employees, typically comprised of the amount of unearned compensation (deferred compensation cost), compensation expense, and changes in the quantity and fair value of the shares (or other type of equity) granted, exercised, forfeited, and issued and outstanding pertaining to that plan. Disclosure may also include nature and general terms of such arrangements that existed during the period and potential effects of those arrangements on shareholders, effect of compensation cost arising from equity-based payment arrangements on the income statement, method of estimating the fair value of the goods or services received, or the fair value of the equity instruments granted, during the period, cash flow effects resulting from equity-based payment arrangements and, for registrants that accelerate vesting of out of the money share options, reasons for the decision to accelerate. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5047-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109197908&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://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=109197908&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=109197908&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=109197908&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=109197908&loc=d3e5070-113901 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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