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Stock Incentive Plans (Tables) | 12 Months Ended
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Dec. 31, 2019
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, 2019, 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, 2018 |  |  | 372,260 |  |  | $ | 39.08 |  |  |  | — |  |  |  | — |
Options exercised |  |  | (54,420 | ) |  |  | 13.87 |  |  |  | — |  |  |  | — |
Outstanding at December 31, 2019 |  |  | 317,840 |  |  |  | 43.40 |  |  |  | 4.49 |  |  |  | 14,958 |
Exercisable at December 31, 2019 |  |  | 195,340 |  |  |  | 19.60 |  |  |  | 2.16 |  |  | $ | 13,841 |
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, 2018 |  |  | 203,854 |  |  | $ | 60.93 |
Granted |  |  | 72,803 |  |  |  | 79.55 |
Vested |  |  | (98,829 | ) |  |  | 56.49 |
Cancelled/Forfeited |  |  | (4,355 | ) |  |  | 70.12 |
Nonvested at December 31, 2019 |  |  | 173,473 |  |  | $ | 71.49 |
Schedule of Performance Share Unit Activity | The following table presents PSU activity:
|  |  |  |  |  | Weighted Average |
|  |  |  |  |  | Grant Date |
|  | Units |  |  | Fair Value |
Nonvested at December 31, 2018 |  |  | 33,325 |  |  | $ | 66.34 |
Granted |  |  | 11,488 |  |  |  | 72.02 |
Vested |  |  | (3,969 | ) |  |  | 74.60 |
Cancelled/Forfeited |  |  | (5,018 | ) |  |  | 64.76 |
Nonvested at December 31, 2019 |  |  | 35,826 |  |  | $ | 67.47 |

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- Definition Tabular disclosure of the number and weighted-average grant date fair value for restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock units that were granted, vested, or forfeited during the year. + 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)(1) -URI http://asc.fasb.org/extlink&oid=116856206&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=116856206&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=116856206&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=116856206&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=116856206&loc=d3e5070-113901 + Details
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