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Employee Benefit Plans (Tables)
 12 Months Ended
Dec. 31, 2023
Retirement Benefits [Abstract]  
Combined Activity in Corporations Defined Benefit Pension Plans
We use a December 31 measurement date for our defined benefit plans. Combined activity in our defined benefit pension plans was as follows:
202320222021
Change in plan assets:
Fair value of plan assets at beginning of year$161,823 $197,747 $182,088 
Actual return on plan assets22,477 (26,108)24,908 
Employer contributions1,105 1,114 1,236 
Benefits paid(10,794)(10,930)(10,485)
Fair value of plan assets at end of year174,611 161,823 197,747 
Change in benefit obligation:
Benefit obligation at beginning of year143,944 185,925 197,593 
Interest cost6,983 4,017 3,341 
Actuarial (gain) loss2,239 (35,068)(4,524)
Benefits paid(10,794)(10,930)(10,485)
Benefit obligation at end of year142,372 143,944 185,925 
Funded status of the plan at end of year and accrued benefit (liability) recognized
$32,239 $17,879 $11,822 
Accumulated benefit obligation at end of year$142,372 $143,944 $185,925 
Disaggregated Information Related to Corporations Defined Benefit Pension Plans
Certain disaggregated information related to our defined benefit pension plans as of year-end was as follows:
Retirement PlanRestoration Plan
2023202220232022
Projected benefit obligation$130,750 $131,648 $11,622 $12,296 
Accumulated benefit obligation130,750 131,648 11,622 12,296 
Fair value of plan assets174,611 161,823 — — 
Funded status of the plan at end of year and accrued benefit (liability) recognized
43,861 30,175 (11,622)(12,296)
Net Periodic Benefit Cost (Benefit)
The components of the combined net periodic cost (benefit) for our defined benefit pension plans are presented in the table below.
202320222021
Expected return on plan assets, net of expenses$(10,959)$(13,966)$(12,839)
Interest cost on projected benefit obligation6,983 4,017 3,341 
Net amortization and deferral3,479 2,964 6,116 
Net periodic expense (benefit)$(497)$(6,985)$(3,382)
Defined Benefit Pension Plans Recognized as Component of Other Comprehensive Income
Amounts related to our defined benefit pension plans recognized as a component of other comprehensive income were as follows:
202320222021
Net actuarial gain (loss)$12,757 $(2,041)$22,709 
Deferred tax (expense) benefit(2,679)429 (4,769)
Other comprehensive income (loss), net of tax$10,078 $(1,612)$17,940 
Defined Benefit Pension Plans Not Recognized as Component of Combined Net Period Benefit Cost
Amounts recognized as a component of accumulated other comprehensive loss as of year-end that have not been recognized as a component of the combined net periodic benefit cost of our defined benefit pension plans are presented in the following table.
20232022
Net actuarial loss$(30,918)$(43,675)
Deferred tax benefit6,493 9,172 
Amounts included in accumulated other comprehensive income/loss, net of tax(24,425)(34,503)
Weighted-Average Assumptions Used to Determine Benefit Obligations
The weighted-average assumptions used to determine the benefit obligations as of the end of the years indicated and the net periodic benefit cost for the years indicated are presented in the table below. Because the plans were frozen, increases in compensation are not considered after 2001.
202320222021
Benefit obligations:
Discount rate4.95 %5.14 %2.79 %
Net periodic benefit cost:
Discount rate5.14 %2.79 %2.43 %
Expected return on plan assets7.00 7.25 7.25 
Fair Value of Plan Assets
The major categories of assets in our Retirement Plan as of year-end are presented in the following table. Assets are segregated by the level of the valuation inputs within the fair value hierarchy established by ASC Topic 820 “Fair Value Measurements and Disclosures,” utilized to measure fair value (see Note 16 - Fair Value Measurements). Our Restoration Plan is unfunded.
20232022
Level 1:
Mutual funds and ETFs$38,793 $154,391 
U.S. Treasury26,633 — 
Common stock13,001 — 
Cash and cash equivalents1,241 7,432 
Level 2:
Corporate bonds and notes58,669 — 
U.S. government agency securities7,041 — 
States and political subdivisions29,233 — 
Total fair value of plan assets$174,611 $161,823 
Expected Future Benefit Payments Related to Defined Benefit Plans
As of December 31, 2023, expected future benefit payments related to our defined benefit plans were as follows:
2024$12,022 
202511,966 
202611,967 
202711,874 
202811,511 
2029 through 203350,461 
$109,801 
Disclosure of Share-based Compensation Arrangements by Share-based Payment Award [Table Text Block]
A combined summary of activity in our active stock plans is presented in the table. Performance stock units outstanding are presented assuming attainment of the maximum payout rate as set forth by the performance criteria. The target award level for performance stock units granted in 2023, 2022 and 2021 was 66,471, 35,015 and 30,723, respectively. As of December 31, 2023, there were 205,090 shares remaining available for grant for future awards.
Director Deferred
Stock Units
Outstanding		Non-Vested
Restricted Stock Units
Outstanding		Performance Stock Units OutstandingStock Options
Outstanding
Number of UnitsWeighted-
Average
Fair Value
at Grant		Number
of Shares/Units		Weighted-
Average
Fair Value
at Grant		Number of UnitsWeighted-
Average
Fair Value
at Grant		Number
of Shares		Weighted-
Average
Exercise
Price
January 1, 202052,860 $75.47 470,359 $86.24 201,257 $77.18 1,739,559 $66.11 
Granted5,940 117.90 95,258 130.36 46,086 121.46 — — 
Exercised/vested(2,499)92.03 (88,250)98.90 (35,131)92.27 (861,878)63.14 
Forfeited/expired— — (28,030)87.08 (9,752)75.70 — — 
December 31, 202156,301 79.21 449,337 93.05 202,460 84.71 877,681 69.02 
Granted5,382 133.67 119,176 142.56 52,527 133.40 — — 
Exercised/vested(16,022)74.89 (97,154)94.81 (25,180)87.18 (261,454)63.72 
Forfeited/expired— — (6,040)93.28 (16,058)87.18 — — 
December 31, 202245,661 87.15 465,319 105.36 213,749 96.20 616,227 71.27 
Granted8,503 103.47 217,561 85.39 99,710 74.71 — — 
Exercised/vested— — (108,920)94.00 (28,151)85.74 (130,286)71.37 
Forfeited/expired— — (7,154)114.53 (18,254)85.74 — — 
December 31, 202354,164 89.71 566,806 99.77 267,054 89.99 485,941 71.25 
Options Outstanding and Exercisable
Other information regarding options outstanding and exercisable as of December 31, 2023 is as follows:
Options OutstandingOptions Exercisable
Range of
Exercise Prices		Number
of Shares		Weighted-
Average
Exercise Price		Weighted-
Average
Remaining
Contractual Life
in Years		Number
of Shares		Weighted-
Average
Exercise
Price
$65.01 to$70.00 270,031 $65.11 1.80270,031 $65.11 
75.01 to80.00 215,910 78.92 0.82215,910 78.92 
Total485,941 71.25 1.37485,941 71.25 
Total intrinsic value$18,098 $18,098 
Shares Issued in Connection With Stock Compensation Awards
Shares issued in connection with stock compensation awards are issued from available treasury shares. If no treasury shares are available, new shares are issued from available authorized shares. Shares issued in connection with stock compensation awards along with other related information were as follows:
202320222021
New shares issued from available authorized shares49,887 118,389 — 
Shares issued from available treasury stock217,470 281,421 987,758 
Total267,357 399,810 987,758 
Proceeds from stock option exercises$9,299 $16,659 $54,417 
Intrinsic value of stock options exercised3,614 19,616 43,904 
Fair value of restricted/director deferred stock units vested13,445 19,308 15,751 
Stock-Based Compensation Expense
Stock-based compensation expense and the related income tax benefit is presented in the following table. The service period for performance stock units granted each year begins on January 1 of the following year.
202320222021
Non-vested restricted stock units$16,734 $13,162 $9,977 
Director deferred stock units880 720 700 
Performance stock units6,976 4,440 2,076 
Total$24,590 $18,322 $12,753 
Income tax benefit$4,120 $2,969 $1,713 
Unrecognized Stock-Based Compensation Expense
Unrecognized stock-based compensation expense and the weighted-average period over which the expense is expected to be recognized at December 31, 2023 is presented in the table below. Unrecognized stock-based compensation expense related to performance stock units is presented assuming attainment of the maximum payout rate as set forth by the performance criteria.
Unrecognized ExpenseWeighted-Average Number of Years for Expense Recognition
Non-vested restricted stock units$22,665 2.13
Performance stock units9,784 2.25
Total$32,449