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Stock Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2022
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Share-based Payment Arrangement, Activity [Table Text Block] | Following is a summary of stock option activity for the year ended December 31, 2022, relating to the stock options awarded under the 2018 LTIP and the 2009 LTIP:
| Shares |  | Weighted Average Exercise Price |  | Weighted Average Remaining Contractual Term (Years) |  | Aggregate Intrinsic Value(a) (In thousands)
Options outstanding at December 31, 2021 | 1,594,600 |  |  | $ | 37.76 |  |  | 7.34 |  | $ | 39,016 |
Granted | 474,000 |  |  | 47.59 |  |  |  |  |
Exercised | (49,900) |  |  | 27.36 |  |  |  |  |
Options outstanding at December 31, 2022 | 2,018,700 |  |  | $ | 40.33 |  |  | 7.06 |  | $ | 15,241 |
Options vested or expected to vest at December 31, 2022 | 1,976,300 |  |  | $ | 40.21 |  |  | 7.04 |  | $ | 15,125 |
Options exercisable at December 31, 2022 | 872,300 |  |  | $ | 33.22 |  |  | 5.66 |  | $ | 11,984 |
(a)Intrinsic value is defined as the amount by which the fair value of the underlying common shares exceeds the exercise price of the option.
Five Year Service Stock Options [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] | The fair value of our five-year service-based stock options granted during the years ended December 31, 2022, 2021 and 2020 was established at the date of grant using the Black-Scholes pricing model, with the weighted average assumptions as follows:
| Year Ended December 31,
| 2022 |  | 2021 |  | 2020
Risk-free interest rate | 1.87 | % |  | 0.66 | % |  | 1.42%
Expected volatility | 34.06 | % |  | 31.66 | % |  | 29.15%
Expected term (in years) | 5.4 |  | 5.5 |  | 5.6
Weighted average grant date fair value of options granted during the period | $ | 16.29 |  | $ | 15.69 |  | $ | 12.65

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- Definition Tabular disclosure of activity for award under share-based payment arrangement. Includes, but is not limited to, outstanding award at beginning and end of year, granted, exercised, forfeited, 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 (e) -URI https://asc.fasb.org/extlink&oid=128089324&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 (c)(2) -URI https://asc.fasb.org/extlink&oid=128089324&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 (d) -URI https://asc.fasb.org/extlink&oid=128089324&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 https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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