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Stock Options and Incentive Plans (Tables) | 12 Months Ended
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Dec. 31, 2019
Share-based Payment Arrangement [Abstract] |
Schedule of Stock Option Activity | Activity with respect to these plans is as follows:
|  | 2019 |  | 2018 |  | 2017
Shares under option January 1 |  | 18,940 |  | 29,340 |  | 62,390
Options canceled |  | — |  | — |  | 150
Options exercised |  | 6,990 |  | 10,400 |  | 32,900
Shares under option at December 31 |  | 11,950 |  | 18,940 |  | 29,340
Options exercisable at December 31 |  | 11,950 |  | 18,940 |  | 29,340
The weighted average exercise price is as follows:
|  | 2019 |  | 2018 |  | 2017
Shares under option January 1 |  | $17.87 |  | $18.40 |  | $18.28
Options canceled |  | — |  | — |  | 20.63
Options exercised |  | 16.06 |  | 19.38 |  | 18.16
Shares under option December 31 |  | 18.93 |  | 17.87 |  | 18.40
Options exercisable December 31 |  | 18.93 |  | 17.87 |  | 18.40
Schedule of Executive Management Share-based Compensation Activity | As of December 31, 2019, there were 1,115,472 shares of Company stock authorized for the payment of awards under these plans. Information with respect to these plans is presented below:
|  | Number of shares |  | Weighted average grant date value per share |  | Year-end intrinsic value (000's)
Shares potentially payable at January 1, 2017 |  | 189,418 |  | $36.90 |  | $6,989
Forfeitures |  | — |  | — |  |
Payments |  | (75,545) |  | $36.35 |  |
Shares accrued based on 2017 performance |  | 43,532 |  | $48.26 |  |
Shares potentially payable at December 31, 2017 |  | 157,405 |  | $40.30 |  | $6,343
Forfeitures |  | — |  |  |  |
Payments |  | (79,762) |  | $39.90 |  |
Shares accrued based on 2018 performance |  | 34,822 |  | $70.59 |  |
Shares potentially payable at December 31, 2018 |  | 112,465 |  | $49.96 |  | $5,619
Forfeitures |  | — |  | — |  |
Payments |  | (45,689) |  | $36.74 |  |
Shares accrued based on 2019 performance |  | 14,936 |  | $92.12 |  |
Shares potentially payable at December 31, 2019 |  | 81,712 |  | $65.06 |  | $5,316
Schedule of Other Management Share-based Compensation Activity | The determination of compensation expense for other management share-based compensation plans is based on the number of outstanding share units, the end-of-period share price, and Company performance. Information with respect to these plans is presented below:
|  | Number of shares |  | Weighted average value per share |  | Cash paid for share based liabilities (000's)
Share units potentially payable at January 1, 2017 |  | 261,145 |  |  |  |
Grants |  | 96,505 |  |  |  |
Changes due to performance |  | (11,891) |  |  |  |
Payments |  | (89,190) |  | $46.64 |  | $4,160
Forfeitures |  | (20,473) |  |  |  |
Share units potentially payable at December 31, 2017 |  | 236,096 |  |  |  |
Grants |  | 65,370 |  |  |  |
Changes due to performance |  | 14,343 |  |  |  |
Payments |  | (75,545) |  | $62.69 |  | $4,736
Forfeitures |  | (12,963) |  |  |  |
Share units potentially payable at December 31, 2018 |  | 227,301 |  |  |  |
Grants |  | 58,878 |  |  |  |
Changes due to performance |  | 21,740 |  |  |  |
Payments |  | (69,912) |  | $70.67 |  | $5,528
Forfeitures |  | (22,935) |  |  |  |
Share units potentially payable at December 31, 2019 |  | 215,072 |  |  |  |

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- Definition Disclosure of the number and weighted-average grant date fair value for restricted stock and restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock and restricted stock units that were granted, vested, or forfeited during the year. + References No definition available. + Details
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