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Postretirement Benefits (Tables)
 9 Months Ended
Sep. 30, 2021
Retirement Benefits [Abstract]  
Pension Assets by Component at Fair Value
Pension Assets by Component at September 30, 2021
 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
% to
Total
Corporate bonds:
Financial$— $53,927 $— $53,927 9 
Utilities— 44,135 — 44,135 8 
Energy— 22,945 — 22,945 4 
Other corporates— 89,212 — 89,212 16 
Total corporate bonds— 210,219 — 210,219 37 
Exchange traded fund(1)
283,277 — — 283,277 49 
Other bonds— 244 — 244 — 
Guaranteed annuity contract(2)
— 34,910 — 34,910 6 
Short-term investments9,605 — — 9,605 2 
Other16,214 — — 16,214 3 
$309,096 $245,373 $— 554,469 97 
Other long-term investments(3)
14,455 3 
Total pension assets
$568,924 100 
(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 Non-Exempt Employees Defined Benefit Pension Plan ("American Income Pension Plan").
(3)Included in other long-term investments is an investment fund that reports the Globe Life Inc. Pension Plan's pro-rata share of the limited partnership's net asset value per share or its equivalent (NAV), as a practical expedient for fair value. The Globe Life Inc. Pension Plan owns less than 1% of the investment fund. As of September 30, 2021, the expected term of the investment fund is approximately 3 years and the commitment of the investment is fully funded. The investment is non-redeemable.
Pension Assets by Component at December 31, 2020
 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
% to
Total
Corporate bonds:
Financial$— $52,252 $— $52,252 10 
Utilities— 45,888 — 45,888 9 
Energy— 22,480 — 22,480 4 
Other corporates— 88,983 — 88,983 17 
Total corporate bonds— 209,603 — 209,603 40 
Exchange traded fund(1)
245,170 — — 245,170 46 
Other bonds— 258 — 258 — 
Guaranteed annuity contract(2)
— 30,119 — 30,119 6 
Short-term investments20,960 — — 20,960 4 
Other7,109 — — 7,109 1 
$273,239 $239,980 $— 513,219 97 
Other long-term investments(3)
16,313 3 
Total pension assets
$529,532 100 
(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 Pension Plan.
(3)Included in other long-term investments is an investment fund that reports the Globe Life Inc. Pension Plan's pro-rata share of the limited partnership's net asset value per share or its equivalent (NAV), as a practical expedient for fair value. The Globe Life Inc. Pension Plan owns approximately 1% of the investment fund. As of December 31, 2020, the expected term of the investment fund is approximately 4 years and the commitment of the investment is fully funded. The investment is non-redeemable.
Information Regarding the SERP The following table includes information regarding the SERP.
Nine Months Ended
September 30,
20212020
Premiums paid for insurance coverage$2,193 $2,480 
September 30,
2021		December 31,
2020
Total investments:
Company owned life insurance $54,380 $51,361 
Exchange traded funds82,000 75,390 
$136,380 $126,751 
Pension Liability The following table presents liabilities for the defined benefit pension plans and SERP at September 30, 2021 and December 31, 2020.
September 30,
2021		December 31,
2020
Pension Plans$705,371 $667,753 
SERP96,179 95,560 
Pension benefit obligation
$801,550 $763,313 
Net Periodic Benefit Cost The following table presents the net periodic benefit costs for the Pension Plans and SERP by expense components for the three and nine months ended September 30, 2021 and 2020. Components of Net Periodic Benefit Cost
Three Months Ended
September 30,		Nine Months Ended
September 30,
 2021202020212020
Service cost$7,919 $6,116 $23,755 $18,347 
Interest cost5,467 5,653 16,403 16,951 
Expected return on assets(8,083)(7,390)(24,249)(22,171)
Amortization:
Prior service cost158 158 474 474 
Actuarial (gain) loss4,984 3,921 14,953 11,770 
Net periodic benefit cost
$10,445 $8,458 $31,336 $25,371