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Postretirement Benefits (Tables)
 3 Months Ended
Mar. 31, 2024
Retirement Benefits [Abstract]  
Schedule of Pension Assets by Component at Fair Value
Pension Assets: The following table presents the assets of the Company's Pension Plans at March 31, 2024 and December 31, 2023.
Pension Assets by Component at March 31, 2024

 Fair Value Determined by:  
 
Quoted Prices in
Active Markets
for Identical
Assets (Level 1)
Significant
Observable
Inputs (Level 2)
Significant
Unobservable
Inputs (Level 3)
Total
Amount
% of
Total
Exchange traded fund(4)
$26,481 $— $— $26,481 5 
Equity exchange traded fund(1)
330,810 — — 330,810 56 
U.S. Government and Agency— 159,108 — 159,108 27 
Other bonds— 4 — 4 — 
Guaranteed annuity contract(2)
— 43,602 — 43,602 7 
Short-term investments3,016 — — 3,016 1 
Other1,487 — — 1,487 — 
$361,794 $202,714 $— 564,508 96 
Other long-term investments(3)
23,670 4 
Total pension assets
$588,178 100 
(1)A fund including marketable securities that mirror the S&P 500 index.
(2)Representing a guaranteed annuity contract issued by Globe Life Inc.'s subsidiary, American Income Life Insurance Company, to fund the obligations of the American Income Life Insurance Company Collective Bargaining Agreement Employees Pension Plan.
(3)Includes non-redeemable investment funds that report the Globe Life Inc. Pension Plan's pro-rata share of the limited partnership's net asset value (NAV) per share, or its equivalent, as a practical expedient for fair value. As of March 31, 2024, the Globe Life Inc. Pension Plan owned less than 1% of two long-term investment funds.
(4)A fund including U.S. dollar-denominated investment-grade securities issued by industrial, utility, and financial companies with maturities greater than 10 years.
Pension Assets by Component at December 31, 2023
 Fair Value Determined by:  

Quoted Prices in
Active Markets
for Identical
Assets (Level 1)
Significant
Observable
Inputs (Level 2)
Significant
Unobservable
Inputs (Level 3)
Total
Amount
% of
Total
Exchange traded fund(4)
$18,715 $— $— $18,715 3 
Equity exchange traded fund(1)
315,886 — — 315,886 55 
U.S. Government and Agency— 167,450 — 167,450 30 
Other bonds— 5 — 5 — 
Guaranteed annuity contract(2)
— 43,428 — 43,428 8 
Short-term investments6,506 — — 6,506 1 
Other463 — — 463 — 
$341,570 $210,883 $— 552,453 97 
Other long-term investments(3)
18,314 3 
Total pension assets
$570,767 100 
(1)A fund including marketable securities that mirror the S&P 500 index.
(2)Representing a guaranteed annuity contract issued by Globe Life Inc.'s subsidiary, American Income Life Insurance Company, to fund the obligations of the American Income Life Insurance Company Collective Bargaining Agreement Employees Pension Plan.
(3)Includes non-redeemable investment funds that report the Globe Life Inc. Pension Plan's pro-rata share of the limited partnership's net asset value (NAV) per share, or its equivalent, as a practical expedient for fair value. As of December 31, 2023, the Globe Life Inc. Pension Plan owned less than 1% of two long-term investment funds.
(4)A fund including U.S. dollar-denominated investment-grade securities issued by industrial, utility, and financial companies with maturities greater than 10 years.
Schedule of Information Regarding the SERP The following tables include premiums paid for the company owned life insurance (COLI) at March 31, 2024 and 2023 and investments of the Rabbi Trust at March 31, 2024 and December 31, 2023.
Three Months Ended
March 31,
20242023
Premiums paid for insurance coverage$443 $443 
March 31,
2024		December 31,
2023
Total investments:
COLI
$55,974 $55,185 
Exchange traded funds90,514 86,156 
$146,488 $141,341 
Schedule of Pension Liability The following table presents liabilities for the defined benefit pension plans and SERP at March 31, 2024 and December 31, 2023.
March 31,
2024		December 31,
2023
Pension Plans$574,981 $554,957 
SERP72,453 72,603 
Benefit obligation
$647,434 $627,560 
Schedule of Net Periodic Benefit Cost The following table presents the net periodic benefit costs for the defined benefit pension plans and SERP by expense components for the three month periods ended March 31, 2024 and 2023.
Components of Net Periodic Benefit Cost
Three Months Ended
March 31,
 20242023
Service cost—benefits earned during the period$6,221 $5,392 
Interest cost on projected benefit obligation8,267 7,834 
Expected return on assets(10,646)(9,656)
Amortization:
Prior service cost269 269 
Actuarial (gain) loss6 (52)
Net periodic benefit cost
$4,117 $3,787