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Share-Based Compensation and Benefit Plans (Tables) | 9 Months Ended
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Sep. 30, 2019
Restricted stock [Member] |
Share-Based Compensation and Benefit Plans |
Summary of activity of share-based compensation |
| For the Three Months Ended September 30, |  | For the Nine Months Ended September 30,
| 2019 |  | 2018 |  | 2019 |  | 2018
Compensation expense for shares issued under the ESPP | $ | 622 |  |  | $ | 569 |  |  | $ | 1,831 |  |  | $ | 1,689 |
Income tax benefit from compensation expense related to shares issued under the ESPP | 155 |  |  | 141 |  |  | 456 |  |  | 418 |
Compensation expense for restricted shares awarded | 351 |  |  | 339 |  |  | 1,038 |  |  | 1,031 |
Income tax benefit from compensation expense related to restricted awards | $ | 87 |  |  | $ | 84 |  |  | $ | 258 |  |  | $ | 255 |
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 | 191 |  |  | 363.43 |
Exercised | (233 | ) |  | 123.26 |
Forfeited | (21 | ) |  | 261.28 |
Outstanding at September 30, 2019 | 1,797 |  |  | $ | 204.41 |
Exercisable at September 30, 2019 | 1,185 |  |  | $ | 159.01 |
Black-Scholes option pricing model |
| For the Nine Months Ended September 30,
| 2019 |  | 2018
Risk free interest rate | 2.34 | % |  | 2.61 | %
Expected life | 5.9 Years |  |  | 6.0 Years |
Expected volatility | 25.0 | % |  | 23.9 | %
Expected dividend yield | — | % |  | — | %
Summary of activity of share-based compensation |
| For the Three Months Ended September 30, |  | For the Nine Months Ended September 30,
| 2019 |  | 2018 |  | 2019 |  | 2018
Compensation expense for stock options awarded | $ | 4,590 |  |  | $ | 4,084 |  |  | $ | 13,709 |  |  | $ | 12,424 |
Income tax benefit from compensation expense related to stock options | 1,143 |  |  | 1,010 |  |  | 3,415 |  |  | 3,074 |

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- Definition Tabular disclosure of share-based payment arrangement. + 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=116856206&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=116856206&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=116856206&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=116856206&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=116856206&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=116856206&loc=d3e5070-113901 + Details
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