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Stock Incentive Plans (Tables) | 12 Months Ended
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Dec. 31, 2020
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract] |
Summary of Stock Options Activity | A summary of the status of the Company’s stock options at December 31, 2020, together with changes during the periods then ended, is presented below:
|  |  |  |  |  |  |  |  |  | Weighted |  |  |  |  |
|  |  |  |  |  | Weighted |  |  | Average |  |  | Aggregate |
|  |  |  |  |  | Average |  |  | Remaining |  |  | Intrinsic |
|  | Number |  |  | Exercise |  |  | Contractual |  |  | Value |
|  | of Options |  |  | Price |  |  | Term (Years) |  |  | (In Thousands) |
Outstanding at December 31, 2019 |  |  | 317,840 |  |  | $ | 43.40 |  |  |  | — |  |  |  | — |
Options exercised |  |  | (138,192 | ) |  |  | 19.30 |  |  |  | — |  |  |  | — |
Options cancelled |  |  | (40,000 | ) |  |  | 82.21 |  |  |  | — |  |  |  | — |
Outstanding at December 31, 2020 |  |  | 139,648 |  |  |  | 56.13 |  |  |  | 4.88 |  |  |  | 2,807 |
Exercisable at December 31, 2020 |  |  | 56,648 |  |  | $ | 21.15 |  |  |  | 1.71 |  |  | $ | 2,807 |
Summary of Fair Value of Stock Option Awards Under Black-Scholes Option-Pricing Model | The fair value of stock option awards as determined under the Black-Scholes option-pricing model was estimated with the following weighted-average assumptions:
|  | 2018 |
Expected volatility |  |  |  | 42.2 | %
Risk free interest rate |  |  |  | 2.7 | %
Expected dividend yield |  |  |  | 1.2 | %
Expected term |  |  | 8.3 years |
Weighted average fair value per share |  | $ | 36.41 |
Schedule of Restricted Stock Unit Activity | The following table presents restricted stock unit activity:
|  |  |  |  |  | Weighted Average |
|  |  |  |  |  | Grant Date |
|  | Units |  |  | Fair Value |
Nonvested at December 31, 2019 |  |  | 173,473 |  |  | $ | 71.49 |
Granted |  |  | 126,206 |  |  |  | 49.65 |
Vested |  |  | (62,244 | ) |  |  | 63.93 |
Cancelled/Forfeited |  |  | (55,612 | ) |  |  | 67.94 |
Nonvested at December 31, 2020 |  |  | 181,823 |  |  | $ | 59.16 |
Schedule of Performance Share Unit Activity | The following table presents PSU activity:
|  |  |  |  |  | Weighted Average |
|  |  |  |  |  | Grant Date |
|  | Units |  |  | Fair Value |
Nonvested at December 31, 2019 |  |  | 35,826 |  |  | $ | 67.47 |
Vested |  |  | (13,912 | ) |  |  | 53.42 |
Cancelled/Forfeited |  |  | (13,450 | ) |  |  | 76.15 |
Nonvested at December 31, 2020 |  |  | 8,464 |  |  | $ | 76.78 |

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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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