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Incentive Plans (Tables) | 12 Months Ended
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Dec. 31, 2020
Share-based Payment Arrangement [Abstract] |
Schedules of Executive Management Share-based Compensation Activity | 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, 2018 | 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 |
Forfeitures | — |  |  | $ | — |  |  |
Payments | (20,680) |  |  | $ | 47.35 |  |  |
Shares accrued based on 2020 performance | 36,808 |  |  | $ | 73.43 |  |  |
Shares potentially payable at December 31, 2020 | 97,840 |  |  | $ | 71.95 |  |  | $ | 7,040 |
Schedules of Other 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, 2018 | 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 |  |  |  |  |
Grants | 63,104 |  |  |  |  |
Changes due to performance | 27,921 |  |  |  |  |
Payments | (80,808) |  |  | $ | 73.04 |  |  | $ | 5,848 |
Forfeitures | (11,441) |  |  |  |  |
Share units potentially payable at December 31, 2020 | 213,848 |  |  |  |  |

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- Definition Tabular disclosure of the changes in outstanding nonvested performance-based units. + 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=120381028&loc=d3e5070-113901 + Details
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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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