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Stock Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2019
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, 2019, 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, 2018 | 2,212,690 |  |  | $ | 22.82 |  |  | 6.58 |  | $ | 3,123 |
Granted | 423,500 |  |  | 27.99 |  |  |  |  |
Exercised | (954,370 | ) |  | 20.60 |  |  |  |  |
Forfeited | (58,100 | ) |  | 27.37 |  |  |  |  |
Options outstanding at December 31, 2019 | 1,623,720 |  |  | $ | 25.30 |  |  | 7.22 |  | $ | 22,836 |
Options vested or expected to vest at December 31, 2019 | 1,571,685 |  |  | $ | 25.25 |  |  | 7.19 |  | $ | 22,198 |
Options exercisable at December 31, 2019 | 741,520 |  |  | $ | 22.90 |  |  | 5.97 |  | $ | 12,198 |
(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, 2019, 2018 and 2017 was established at the date of grant using the Black-Scholes pricing model, with the weighted average assumptions as follows:
| Year Ended December 31,
| 2019 |  | 2018 |  | 2017
Risk-free interest rate | 2.51 | % |  | 2.72 | % |  | 1.96 | %
Expected volatility | 28.81 | % |  | 32.01 | % |  | 39.49 | %
Expected term (in years) | 5.9 |  |  | 5.7 |  |  | 5.9 |
Weighted average grant date fair value of options granted during the period | $ | 9.06 |  |  | $ | 11.31 |  |  | $ | 9.45 |

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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 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 (c)(2) -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 (d) -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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