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Share-Based Payments (Tables) | 3 Months Ended
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Mar. 31, 2020
Share-based Payment Arrangement [Abstract] |
Schedule of Nonvested Share Activity [Table Text Block] |
|  | Number of Shares |  |  | Weighted Average Grant-Date Fair Value |
Nonvested options – beginning of period |  |  | 514,210 |  |  | $ | 12.36 |
Nonvested options granted |  |  | 9,000 |  |  | $ | 12.16 |
Nonvested options vested or forfeited |  |  | (10,180 | ) |  | $ | 10.10 |
Nonvested options – end of period |  |  | 513,030 |  |  | $ | 12.40 |
Share-based Payment Arrangement, Option, Activity [Table Text Block] |
|  | Shares |  |  | Weighted Average Exercise Price |
Outstanding at January 1, 2020 |  |  | 815,800 |  |  | $ | 49.89 |
Options granted |  |  | 9,000 |  |  |  | 69.11 |
Options forfeited |  |  | (2,140 | ) |  |  | 57.03 |
Options exercised |  |  | (18,940 | ) |  |  | 33.82 |
Outstanding at March 31, 2020 |  |  | 803,720 |  |  |  | $ 50. 46 |
Options exercisable |  |  | 290,690 |  |  | $ | 35.09 |
Options available for future grants |  |  | 566,835 |  |  |  |  |
Cash Proceeds Received and Tax Benefit from Share-based Payment Awards [Table Text Block] |
(In thousands) |  | March 31, 2020 |  |  | March 31, 2019 |
Cash proceeds from stock options exercised |  | $ | 641 |  |  | $ | 2,251 |
Tax benefits |  |  | — |  |  |  | 300 |
Intrinsic value of stock options exercised |  |  | 733 |  |  |  | 2,226 |
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] |
|  | March 31, 2020 |  |  | March 31, 2019 |
Weighted average expected stock-price volatility |  |  | 25 | % |  |  | 27 | %
Weighted average expected option life |  |  | 5 years |  |  |  | 5 years |
Weighted average risk-free interest rate |  |  | 1.4 | % |  |  | 2.5 | %
Weighted average dividend yield |  |  | 2.5 | % |  |  | 2.0 | %

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- Definition Tabular disclosure of cash received from exercise of stock options and similar instruments granted under share-based payment arrangements and tax benefit from exercise of stock options. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=116856206&loc=SL79508275-113901 + Details
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- Definition Tabular disclosure of the changes in outstanding nonvested shares. + 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=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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