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Stock Based Compensation (Tables) | 6 Months Ended
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Jun. 30, 2022
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract] |
Summary of Option Activity | The following tables summarize option activity for the six-month period ended June 30, 2022:
|  |  |  |  |  |  |  |  |  | Weighted |  |  | Aggregate |
|  |  |  |  |  | Weighted |  |  | Average |  |  | Intrinsic |
|  |  |  |  |  | Average |  |  | Remaining |  |  | Value |
|  | Options |  |  | Exercise Price |  |  | Contractual Life |  |  | (in 000’s) |
Outstanding options at January 1, 2022 |  |  | 1,669,325 |  |  | $ | 78.63 |  |  |  |  |  |  |  |  |
Options granted |  |  | 296,100 |  |  |  | 115.65 |  |  |  |  |  |  |  |  |
Options exercised |  |  | (88,047 | ) |  |  | 59.38 |  |  |  |  |  |  |  |  |
Options canceled/forfeited |  |  | (7,590 | ) |  |  | 90.80 |  |  |  |  |  |  |  |  |
Outstanding options at June 30, 2022 |  |  | 1,869,788 |  |  | $ | 85.35 |  |  |  | 5.06 |  |  | $ | 58,408 |
Exercisable options at June 30, 2022 |  |  | 905,015 |  |  | $ | 69.91 |  |  |  | 3.58 |  |  | $ | 42,245 |
Summary of Weighted Average Grant-date Assumptions and Weighted Average Fair Values | The fair value of options was estimated using a Black-Scholes based option pricing model with the following weighted average grant-date assumptions and weighted average fair values as of June 30:
|  | 2022 |  | 2021
Weighted-average fair value of grants |  | $ | 21.05 |  |  |  | $ | 17.00 |  |
Risk-free interest rates |  |  | 2.84 |  | % |  |  | 0.69 |  | %
Dividend yield |  |  | 2.50 |  | % |  |  | 2.07 |  | %
Expected volatility |  |  | 22.89 |  | % |  |  | 22.73 |  | %
Expected option life |  |  | 5.06 |  | years |  |  | 4.97 |  | years
Schedule of Restricted Stock Units Activity |
|  |  |  |  |  | Weighted |
|  |  |  |  |  | Average |
|  |  |  |  |  | Grant Date |
|  | RSUs |  |  | Fair Value |
Nonvested at January 1, 2022 |  |  | 45,068 |  |  | $ | 97.67 |
Granted |  |  | 16,705 |  |  |  | 116.60 |
Reinvested |  |  | 197 |  |  |  | 108.86 |
Vested |  |  | (21,380 | ) |  |  | 93.07 |
Forfeited |  |  | (1,030 | ) |  |  | 96.30 |
Nonvested at June 30, 2022 |  |  | 39,560 |  |  | $ | 108.24 |

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- Definition Tabular disclosure of the changes in outstanding nonvested restricted stock units. + 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 (c)(2) -URI http://asc.fasb.org/extlink&oid=120381028&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=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 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=120381028&loc=d3e5070-113901 + Details
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