Incentive Plans (Tables)

12 Months Ended

Dec. 31, 2022

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, 2020	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
Forfeitures	—
Payments	(31,722)	$	66.25
Shares accrued based on 2021 performance	41,512	$	78.06
Shares potentially payable at December 31, 2021	107,630	$	75.99	$	8,179
Forfeitures	—
Payments	(35,897)	$	84.27
Shares accrued based on 2022 performance	64,208	$	86.00
Shares potentially payable at December 31, 2022	135,941	$	79.11	$	10,754

Schedules of Other Share-based Compensation Activity

The determination of compensation expense for the PSP is based on the number of outstanding share units, the end-of-period share price, and Company performance. Information with respect to the PSP 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, 2020	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
Grants	56,536
Changes due to performance	52,296
Payments	(68,622)	$	74.22	$	5,093
Forfeitures	(5,644)
Share units potentially payable at December 31, 2021	248,414
Grants	49,863
Changes due to performance	34,539
Payments	(81,421)	$	85.69	$	6,977
Forfeitures	(24,644)
Share units potentially payable at December 31, 2022	226,751