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Stock-Based Compensation (Tables) | 3 Months Ended
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Mar. 31, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Stock Option Activity | The following table summarizes the Company’s stock option activity and related information for the 2011 Plan, the 2000 Plan and the Directors Plan for the three months ended March 31, 2018:
| Options |  | Weighted Average Exercise Price |  | Weighted Average Remaining Contractual Life |  | Aggregate Intrinsic value (in thousands)
Outstanding at December 31, 2017 | 983,512 |  |  | $ | 40.62 |  |  | 4.0 |  | $ | 40,137 |
Granted | 62,020 |  |  | 71.79 |  |  |  |  | 596 |
Exercised | (154,418 | ) |  | 18.32 |  |  |  |  | 9,741 |
Canceled | (12,866 | ) |  | 67.61 |  |  |  |  | 117 |
Outstanding at March 31, 2018 | 878,248 |  |  | 46.34 |  |  | 4.7 |  | 30,791 |
Exercisable at March 31, 2018 | 711,207 |  |  | 39.62 |  |  | 4.1 |  | 29,714 |
Share-Based Fair Value of Each Option Grant Weighted-Average Assumptions | The fair value of each option grant is estimated on the date of grant using the Black-Scholes option pricing model with the following weighted-average assumptions:
| Three Months Ended March 31,
| 2018 |  | 2017
Dividend yield | 0.33 | % |  | 0.23 | %
Risk-free interest rate | 2.70 | % |  | 2.17 | %
Stock price volatility | 23.9 | % |  | 23.4 | %
Expected life (years) | 5.0 |  |  | 5.0 |
Restricted Stock Activity and Incentive Stock Awards Activity | The following table summarizes the restricted stock activity and related information for the 2011 Plan, the 2000 Plan and the Directors Plan, and incentive stock units activity for the 2011 Plan and the 2000 Plan with related information for the three months ended March 31, 2018:
| Restricted Stock and Units |  | Incentive Stock Units |  | Weighted Average Grant Date Fair Value
Outstanding at December 31, 2017 | 399,000 |  |  | 327,333 |  |  | $ | 78.76 |
Granted | 188,570 |  |  | 172,400 |  |  | 71.79 |
Vested | (104,405 | ) |  | (93,312 | ) |  | 81.61 |
Adjustment for incentive stock awards expected to vest | — |  |  | 26,056 |  |  | 77.72 |
Canceled | (10,367 | ) |  | (13,600 | ) |  | 76.92 |
Outstanding at March 31, 2018 | 472,798 |  |  | 418,877 |  |  |

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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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- Definition Schedule of Incentive Stock Awards Activity and Restricted Stock Activity [Table Text Block] + References No definition available. + Details
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