XML 55 R25.htm IDEA: XBRL DOCUMENT
v3.20.1

Stock Option Plans (Tables) | 3 Months Ended
--- | ---
Mar. 31, 2020
Share-based Payment Arrangement [Abstract] |
Summary of Option Activity | The table below summarizes the option activity for the three months ended March 31, 2020:
|  | Number of Shares |  | Weighted Average Exercise Price per share |  | Aggregate Intrinsic Value
Outstanding at January 1 |  | 1,309,614 |  |  | $ | 53.38 |  |  | $ | 2,528,463 |
Granted |  | — |  |  | — |  |  | — |
Exercised |  | (10,749 | ) |  | 49.19 |  |  | 85,268 |
Expired/Forfeited |  | — |  |  | — |  |  | — |
Outstanding at March 31 |  | 1,298,865 |  |  | 53.42 |  |  | — |
Exercisable at March 31 |  | 752,865 |  |  | 52.47 |  |  | — |

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 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