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Share-Based Compensation and Benefit Plans (Tables) | 12 Months Ended
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Dec. 31, 2018
Share-Based Compensation and Benefit Plans |
Summary of shares authorized and available for future issuance under compensation and benefit plans |
|  | December 31, 2018
Plans |  | Total Shares Authorized for Issuance under the Plans |  | Shares Available for Future Issuance under the Plans
Employee Incentive Plans |  | 34,000 |  |  | 5,573 |
Director Stock Plan |  | 1,000 |  |  | 263 |
Performance Incentive Plan |  | 650 |  |  | 368 |
Employee Stock Purchase Plans |  | 4,250 |  |  | 594 |
Profit Sharing and Savings Plan |  | 4,200 |  |  | 349 |
Restricted stock [Member] |
Share-Based Compensation and Benefit Plans |
Summary of activity of share-based compensation and benefit plans |
| For the Year Ended December 31,
| 2018 |  | 2017 |  | 2016
Compensation expense for restricted shares awarded | $ | 1,370 |  |  | $ | 1,628 |  |  | $ | 1,293 |
Income tax benefit from compensation expense related to restricted shares | $ | 340 |  |  | $ | 621 |  |  | $ | 483 |
Total fair value of restricted shares at vest date | $ | 1,230 |  |  | $ | 1,202 |  |  | $ | 2,384 |
Shares awarded under the plans | 5 |  |  | 4 |  |  | 4 |
Weighted-average grant-date fair value of shares awarded under the plans | $ | 263.89 |  |  | $ | 253.78 |  |  | $ | 264.24 |
Employee stock purchase plan [Member] |
Share-Based Compensation and Benefit Plans |
Summary of ESPP plan activity |
| For the Year Ended December 31,
| 2018 |  | 2017 |  | 2016
Compensation expense for shares issued under the ESPP | $ | 2,285 |  |  | $ | 2,212 |  |  | $ | 2,162 |
Income tax benefit from compensation expense for shares issued under the ESPP | $ | 566 |  |  | $ | 844 |  |  | $ | 807 |
Shares issued under the ESPP | 53 |  |  | 64 |  |  | 54 |
Weighted-average price of shares issued under the ESPP | $ | 245.26 |  |  | $ | 196.72 |  |  | $ | 227.12 |
Employee [Member] | Restricted stock [Member] |
Share-Based Compensation and Benefit Plans |
Summary of restricted stock |
| Shares |  | Weighted-Average Grant-Date Fair Value
Non-vested at December 31, 2017 | 3 |  |  | $ | 244.06 |
Granted during the period | 2 |  |  | 262.38 |
Vested during the period (1) | (1 | ) |  | 232.30 |
Forfeited during the period | — |  |  | — |
Non-vested at December 31, 2018 | 4 |  |  | $ | 260.42 |
(1) | Includes less than one thousand shares withheld to cover employees’ taxes upon vesting.
Director [Member] | Restricted stock [Member] |
Share-Based Compensation and Benefit Plans |
Summary of restricted stock |
| Shares |  | Weighted-Average Grant-Date Fair Value
Non-vested at December 31, 2017 | 5 |  |  | $ | 250.85 |
Granted during the period | 3 |  |  | 265.41 |
Vested during the period | (3 | ) |  | 248.53 |
Forfeited during the period | — |  |  | — |
Non-vested at December 31, 2018 | 5 |  |  | $ | 261.07 |
Stock option [Member] |
Share-Based Compensation and Benefit Plans |
Black-Scholes option pricing model |
| December 31,
| 2018 |  | 2017 |  | 2016
Risk free interest rate | 2.63 | % |  | 1.98 | % |  | 1.44 | %
Expected life | 5.9 Years |  |  | 5.4 Years |  |  | 5.5 Years |
Expected volatility | 24.0 | % |  | 22.4 | % |  | 22.3 | %
Expected dividend yield | — | % |  | — | % |  | — | %
Summary of activity of share-based compensation and benefit plans |
| For the Year Ended December 31,
| 2018 |  | 2017 |  | 2016
Compensation expense for stock options awarded (in thousands) | $ | 16,521 |  |  | $ | 15,561 |  |  | $ | 15,404 |
Income tax benefit from compensation expense related to stock options (in thousands) | 4,093 |  |  | 5,934 |  |  | 5,753 |
Total intrinsic value of stock options exercised (in thousands) | 156,327 |  |  | 135,533 |  |  | 157,115 |
Cash received from exercise of stock options (in thousands) | 61,403 |  |  | 33,229 |  |  | 47,394 |
Weighted-average grant-date fair value of options awarded | $ | 76.57 |  |  | $ | 62.79 |  |  | $ | 63.42 |
Weighted-average remaining contractual life of exercisable options | 4.4 Years |  |  | 3.8 Years |  |  | 3.9 Years |
Stock option [Member] | Employee stock option [Member] |
Share-Based Compensation and Benefit Plans |
Summary of stock options |
| Shares (in thousands) |  | Weighted-Average Exercise Price |  | Average Remaining Contractual Terms |  | Aggregate Intrinsic Value (in thousands)
Outstanding at December 31, 2017 | 2,364 |  |  | $ | 137.08 |  |  |  |  |
Granted | 293 |  |  | 264.34 |  |  |  |  |
Exercised | (763 | ) |  | 80.52 |  |  |  |  |
Forfeited or expired | (34 | ) |  | 231.53 |  |  |  |  |
Outstanding at December 31, 2018 | 1,860 |  |  | $ | 178.57 |  |  | 5.9 Years |  | $ | 308,297 |
Vested or expected to vest at December 31, 2018 | 1,819 |  |  | $ | 176.78 |  |  | 5.8 Years |  | $ | 304,818 |
Exercisable at December 31, 2018 | 1,174 |  |  | $ | 133.24 |  |  | 4.4 Years |  | $ | 247,816 |

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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 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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