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Stock Options and Employee Stock Purchase Plan (Tables) | 6 Months Ended
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Jun. 30, 2021
Share-based Payment Arrangement [Abstract] |
Stock Option Activity | The following table represents stock option activity for the six months ended June 30, 2021:
| Number of Shares |  | Weighted- Average Exercise Price |  | Weighted-Average Remaining Contractual Term (in years) |  | Aggregate Intrinsic Value
Outstanding at January 1, 2021 | 475,601 |  |  | $ | 69.61 |  |  |  |  |
Granted | — |  |  | — |  |  |  |  |
Exercised | (45,351) |  |  | 29.34 |  |  |  |  |
Canceled | — |  |  | — |  |  |  |  |
Outstanding at June 30, 2021 | 430,250 |  |  | $ | 73.85 |  |  | 6.3 |  | $ | 27,405,745 |
Exercisable at June 30, 2021 | 180,250 |  |  | $ | 72.22 |  |  | 5.9 |  | $ | 11,775,745 |
Vested and expected to vest at June 30, 2021 | 363,615 |  |  | $ | 73.64 |  |  | 6.2 |  | $ | 23,239,725 |
Market-Based Restricted Stock Awards, Valuation Assumptions | The weighted-average fair values of market-based shares granted have been estimated utilizing the following assumptions:
| June 30, 2021 |  | June 30, 2020
Underlying stock price at valuation date | $ | 113.27 |  |  | $ | 91.17 |
Expected volatility | 30.3 | % |  | 27.0 | %
Risk-free interest rate | 1.3 | % |  | 0.7 | %
Restricted Stock and Restricted Stock Unit Award Activity | Restricted stock award activity for the six months ended June 30, 2021 is set forth below:
| Shares |  | Weighted-Average Grant-Date Fair Value
Nonvested at January 1, 2021 | 820,566 |  |  | $ | 62.66 |
Granted | — |  |  | — |
Vested | (334,294) |  |  | 64.02 |
Canceled | (2,067) |  |  | 82.38 |
Nonvested at June 30, 2021 | 484,205 |  |  | $ | 61.62 |
Restricted stock unit award activity for the six months ended June 30, 2021 is set forth below:
| Number of Shares |  | Weighted-Average Remaining Contractual Term (in years) |  | Aggregate Intrinsic Value
Outstanding at January 1, 2021 | 209,784 |  |  |  |  |
Granted | 163,380 |  |  |  |  |
Vested | (100,224) |  |  |  |  |
Canceled | — |  |  |  |  |
Outstanding at June 30, 2021 | 272,940 |  |  | 3.4 |  | $ | 37,542,897 |
Vested and expected to vest at June 30, 2021 | 182,186 |  |  | 2.8 |  | $ | 25,059,725 |
Employee Stock Purchase Plan, Valuation Assumptions | The compensation expense related to the Purchase Plan has been estimated utilizing the following assumptions:
| June 30, 2021 |  | June 30, 2020
Risk-free interest rate | 0.02% |  | 0.1%
Expected term (in years) | 0.5 |  | 0.5
Dividend yield | 0.00% |  | 0.00%
Expected volatility | 29.5% |  | 24.0%
Weighted average volatility | 29.5% |  | 24.0%

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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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