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Stock Options and Employee Stock Purchase Plan (Tables) | 12 Months Ended
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Dec. 31, 2020
Share-based Payment Arrangement [Abstract] |
Stock Options Activity | Stock option activity for the years ended December 31, 2020, 2019 and 2018 is summarized as follows:
| Number of Shares |  | Weighted-Average Exercise Price |  | Weighted-Average Remaining Contractual Life (In Years) |  | Aggregate Intrinsic Value
Options outstanding at January 1, 2018 | 375,675 |  |  | $ | 31.30 |  |  |  |  |
Granted | 400,000 |  |  | 75.03 |  |  |  |  |
Exercised | (67,898) |  |  | 22.68 |  |  |  |  |
Canceled | — |  |  | — |  |  |  |  |
Options outstanding at December 31, 2018 | 707,777 |  |  | $ | 56.84 |  |  |  |  |
Granted | — |  |  | — |  |  |  |  |
Exercised | (189,436) |  |  | 32.39 |  |  |  |  |
Canceled | — |  |  | — |  |  |  |  |
Options outstanding at December 31, 2019 | 518,341 |  |  | $ | 65.77 |  |  |  |  |
Granted | — |  |  | — |  |  |  |  |
Exercised | (42,740) |  |  | 23.11 |  |  |  |  |
Canceled | — |  |  | — |  |  |  |  |
Options outstanding at December 31, 2020 | 475,601 |  |  | $ | 69.61 |  |  | 6.2 |  | $13,355,721
Exercisable at December 31, 2020 | 175,601 |  |  | $ | 60.35 |  |  | 4.7 |  | $6,557,721
Vested and expected to vest at December 31, 2020 | 393,281 |  |  | $ | 68.47 |  |  | 6.0 |  | $11,490,350
Summarized Information Concerning Outstanding and Exercisable Options | The following table summarizes information concerning outstanding and exercisable options as of December 31, 2020:
|  | Options Outstanding |  | Exercisable Options
Range of Exercise Prices |  | Number Outstanding December 31, 2020 |  | Weighted Average Remaining Contractual Life |  | Weighted Average Exercise Price |  | Number Exercisable December 31, 2020 |  | Weighted Average Exercise Price
$29.34 |  | 45,351 |  |  | 0.36 years |  | $ | 29.34 |  |  | 45,351 |  |  | $ | 29.34 |
29.53 |  | 7,250 |  |  | 1.17 years |  | 29.53 |  |  | 7,250 |  |  | 29.53 |
67.35 |  | 23,000 |  |  | 4.35 years |  | 67.35 |  |  | 23,000 |  |  | 67.35 |
75.03 |  | 400,000 |  |  | 7.00 years |  | 75.03 |  |  | 100,000 |  |  | 75.03 |
$29.34 - $75.03 |  | 475,601 |  |  | 6.15 years |  | $ | 69.61 |  |  | 175,601 |  |  | $ | 60.35 |
Valuation Assumptions of Stock Options Granted | The weighted-average fair values of stock options granted have been estimated utilizing the following assumptions:
| Years ended December 31,
| 2020 |  | 2019 |  | 2018
Risk-free interest rate | —% |  | —% |  | 2.4%
Expected term (in years) | 0.0 |  | 0.0 |  | 6.7
Dividend yield | —% |  | —% |  | 2.2%
Expected volatility | —% |  | —% |  | 29.2%
Weighted average volatility | —% |  | —% |  | 29.2%
Valuation Assumptions of Market-based Restricted Stock Awards Granted | The weighted-average fair values of market-based restricted stock awards granted have been estimated utilizing the following assumptions:
| December 31, 2020 |  | December 31, 2019 |  | December 31, 2018
Underlying stock price at valuation date | $ | 91.17 |  |  | $ | 84.58 |  |  | $ | 82.11 |
Expected volatility | 27.0 | % |  | 28.3 | % |  | 28.4 | %
Risk-free interest rate | 0.7 | % |  | 2.5 | % |  | 2.9 | %
Restricted Stock and Restricted Stock Unit Award Activity | Restricted stock award activity for the years ended December 31, 2020, 2019 and 2018 is set forth below:
| Shares |  | Weighted-Average Grant-Date Fair Value
Nonvested at January 1, 2018 | 605,566 |  |  | $ | 51.57 |
Granted | 830,256 |  |  | 63.55 |
Vested | (157,972) |  |  | 61.29 |
Canceled | (70,839) |  |  | 74.84 |
Nonvested at December 31, 2018 | 1,207,011 |  |  | $ | 64.82 |
Granted | 187,773 |  |  | 79.00 |
Vested | (172,884) |  |  | 73.65 |
Canceled | (116,841) |  |  | 72.58 |
Nonvested at December 31, 2019 | 1,105,059 |  |  | $ | 64.76 |
Granted | 1,268 |  |  | 98.63 |
Vested | (264,172) |  |  | 70.25 |
Canceled | (21,589) |  |  | 79.34 |
Nonvested at December 31, 2020 | 820,566 |  |  | $ | 62.66 |
Restricted stock unit activity for the years ended December 31, 2020, 2019 and 2018 is set forth below:
| Number of Shares |  | Weighted-Average Remaining Contractual Life (in Years) |  | Aggregate Intrinsic Value
Outstanding at January 1, 2018 | 38,400 |  |  |  |  |
Granted | 20,044 |  |  |  |  |
Vested | (11,540) |  |  |  |  |
Canceled | (5,673) |  |  |  |  |
Outstanding at December 31, 2018 | 41,231 |  |  |  |  |
Granted | 3,844 |  |  |  |  |
Vested | (12,343) |  |  |  |  |
Canceled | (11,858) |  |  |  |  |
Outstanding at December 31, 2019 | 20,874 |  |  |  |  |
Granted | 210,630 |  |  |  |  |
Vested | (9,029) |  |  |  |  |
Canceled | (12,691) |  |  |  |  |
Outstanding at December 31, 2020 | 209,784 |  |  | 3.5 |  | $ | 20,493,799 |
Vested and expected to vest at December 31, 2020 | 135,944 |  |  | 2.7 |  | $ | 13,280,344 |

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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=120381028&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=120381028&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=120381028&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 employee stock purchase plans, including, but not limited to: (a) expected term, (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=120381028&loc=d3e5070-113901 + Details
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- Definition Disclosure of the number and weighted-average grant date fair value for restricted stock and restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock and restricted stock units that were granted, vested, or forfeited during the year. + References No definition available. + Details
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