XML 47 R33.htm IDEA: XBRL DOCUMENT
v3.20.4

Stock Option Plan (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2020
Share-based Payment Arrangement [Abstract] |
Stock Options Issued |
|  | Directors |  |  | Officers |
Grant date |  | May 11, 2018 | May 3, 2019 | April 24, 2020 |  |  | May 11, 2018 | May 3, 2019 | April 24, 2020 |  |
Exercise price |  | $ | 49.46 |  | $ | 55.71 |  | $ | 50.00 |  |  |  | $ | 49.46 |  | $ | 55.71 |  | $ | 50.00 |  |  |
Volatility |  | 0.192 |  | 0.236 |  | 0.258 |  |  |  | 0.177 |  | 0.206 |  | 0.240 |  |  |
Expected life (years) |  | 5.0 | 5.0 | 5.0 |  |  | 7.0 | 7.0 | 7.0 |  |
Assumed yield |  | 3.70 | % | 3.75 | % | 3.80 | % |  |  | 3.75 | % | 3.80 | % | 3.85 | % |  |
Risk-free rate |  | 2.84 | % | 2.33 | % | 0.36 | % |  |  | 2.94 | % | 2.43 | % | 0.51 | % |  |
Summary of Option Activity | The table below summarizes the option activity for the years 2020, 2019, and 2018:
| 2020 |  | 2019 |  | 2018
| Shares |  | Weighted Average Exercise Price |  | Shares |  | Weighted Average Exercise Price |  | Shares |  | Weighted Average Exercise Price
Outstanding at January 1 | 1,309,614 |  |  | $ | 53.38 |  |  | 1,114,169 |  |  | $ | 52.40 |  |  | 913,320 |  |  | $ | 52.80 |
Granted | 238,000 |  |  | 50.00 |  |  | 260,000 |  |  | 55.71 |  |  | 245,000 |  |  | 49.46 |
Exercised | (10,749) |  |  | 49.19 |  |  | (57,055) |  |  | 44.53 |  |  | (39,151) |  |  | 42.98 |
Expired/Forfeited | (34,195) |  |  | 54.09 |  |  | (7,500) |  |  | 56.07 |  |  | (5,000) |  |  | 54.78 |
Outstanding December 31 | 1,502,670 |  |  | 52.86 |  |  | 1,309,614 |  |  | 53.38 |  |  | 1,114,169 |  |  | 52.40 |
Exercisable at December 31 | 971,545 |  |  | 53.01 |  |  | 763,614 |  |  | 52.43 |  |  | 600,919 |  |  | 50.93 |

X
- References No definition available. + Details
Name: | us-gaap_DisclosureOfCompensationRelatedCostsSharebasedPaymentsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- 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
Name: | us-gaap_ScheduleOfShareBasedCompensationStockOptionsActivityTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of the change in stock options. + References No definition available. + Details
Name: | us-gaap_ScheduleOfStockOptionsRollForwardTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration