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Employee Benefit Plans (Tables)
 12 Months Ended
Dec. 31, 2024
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:
202420232022
Change in plan assets:
Fair value of plan assets at beginning of year$174,611 $161,823 $197,747 
Actual return on plan assets5,306 22,477 (26,108)
Employer contributions1,150 1,105 1,114 
Benefits paid(11,340)(10,794)(10,930)
Fair value of plan assets at end of year169,727 174,611 161,823 
Change in benefit obligation:
Benefit obligation at beginning of year142,372 143,944 185,925 
Interest cost6,647 6,983 4,017 
Actuarial (gain) loss(6,779)2,239 (35,068)
Benefits paid(11,340)(10,794)(10,930)
Benefit obligation at end of year130,900 142,372 143,944 
Funded status of the plan at end of year and accrued benefit (liability) recognized
$38,827 $32,239 $17,879 
Accumulated benefit obligation at end of year$130,900 $142,372 $143,944 
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
2024202320242023
Projected benefit obligation$120,179 $130,750 $10,721 $11,622 
Accumulated benefit obligation120,179 130,750 10,721 11,622 
Fair value of plan assets169,727 174,611 — — 
Funded status of the plan at end of year and accrued benefit (liability) recognized
49,548 43,861 (10,721)(11,622)
Net Periodic Benefit Cost (Benefit)
The components of the combined net periodic cost (benefit) for our defined benefit pension plans are presented in the table below.
202420232022
Expected return on plan assets, net of expenses$(9,645)$(10,959)$(13,966)
Interest cost on projected benefit obligation6,647 6,983 4,017 
Net amortization and deferral1,673 3,479 2,964 
Net periodic expense (benefit)$(1,325)$(497)$(6,985)
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:
202420232022
Net actuarial gain (loss)$4,112 $12,757 $(2,041)
Deferred tax (expense) benefit(863)(2,679)429 
Other comprehensive income (loss), net of tax$3,249 $10,078 $(1,612)
Defined Benefit Pension Plans Not Recognized as Component of Combined Net Period Benefit Cost
Amounts recognized as a component of accumulated other comprehensive loss as of year-end that have not been recognized as a component of the combined net periodic benefit cost of our defined benefit pension plans are presented in the following table.
20242023
Net actuarial loss$(26,806)$(30,918)
Deferred tax benefit5,630 6,493 
Amounts included in accumulated other comprehensive income/loss, net of tax(21,176)(24,425)
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.
202420232022
Benefit obligations:
Discount rate5.58 %4.95 %5.14 %
Net periodic benefit cost:
Discount rate4.95 %5.14 %2.79 %
Expected return on plan assets5.70 7.00 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.
20242023
Level 1:
Mutual funds and ETFs$34,564 $38,793 
U.S. Treasury24,341 26,633 
Common stock14,921 13,001 
Cash and cash equivalents431 1,241 
Level 2:
Corporate bonds and notes62,405 58,669 
U.S. government agency securities7,232 7,041 
States and political subdivisions25,833 29,233 
Total fair value of plan assets$169,727 $174,611 
Expected Future Benefit Payments Related to Defined Benefit Plans
As of December 31, 2024, expected future benefit payments related to our defined benefit plans were as follows:
2025$12,080 
202612,025 
202711,905 
202811,596 
202911,488 
2030 through 203449,199 
$108,293 
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 2024, 2023 and 2022 was 21,554, 66,471 and 35,015, respectively. As of December 31, 2024, there were 2,361,570 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, 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 
Granted7,997 116.84 176,892 129.44 32,334 119.17 — — 
Exercised/vested(9,382)80.99 (232,617)91.78 (45,818)57.89 (301,965)74.98 
Forfeited/expired— — (3,219)106.74 (22,913)57.89 — — 
December 31, 202452,779 95.37 507,862 113.72 230,657 103.65 183,976 65.11
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:
202420232022
New shares issued from available authorized shares— 49,887 118,389 
Shares issued from available treasury stock589,782 217,470 281,421 
Total589,782 267,357 399,810 
Proceeds from stock option exercises$22,643 $9,299 $16,659 
Intrinsic value of stock options exercised13,454 3,614 19,616 
Fair value of restricted/director deferred stock units vested35,922 13,445 19,308 
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.
202420232022
Non-vested restricted stock units$19,457 $16,734 $13,162 
Director deferred stock units934 880 720 
Performance stock units(628)6,976 4,440 
Total$19,763 $24,590 $18,322 
Income tax benefit$4,776 $4,120 $2,969 
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, 2024 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$25,827 2.20
Performance stock units12,912 2.02
Total$38,739