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Pension and Other Post-Retirement Benefit Plans (Tables)
 12 Months Ended
Dec. 31, 2021
Retirement Benefits [Abstract]  
Schedule of Net Funded Status
Funded Status  (in thousands):
 Pension PlansPost-retirement
Healthcare Plans
 2021202020212020
Accumulated benefit obligation$839,267 $873,826 $3,142 $3,484 
Change in benefit obligation
Obligation as of January 1$873,826 $779,031 $3,484 $3,707 
Service cost— — 95 139 
Interest cost22,387 27,880 42 91 
Plan transfers3,125 2,895 — — 
Benefits paid(36,109)(34,218)(250)(362)
Curtailments and settlement— (2,435)— (17)
Actuarial (gain) loss(23,962)100,673 (229)(74)
Obligation as of December 31$839,267 $873,826 $3,142 $3,484 
Change in plan assets
Fair value as of January 1$843,895 $746,763 $— $— 
Actual gain (loss) on plan assets37,626 120,057 — — 
Plan transfers3,125 2,895 — — 
Employer contributions1,658 10,833 250 362 
Benefits paid(36,109)(34,218)(250)(362)
Settlement payments$— $(2,435)$— $— 
Fair value as of December 31$850,195 $843,895 $— $— 
Funded status
Overfunded plans, net asset$30,867 $3,447 $— $— 
Underfunded plans
Current liabilities$(1,345)$(1,348)$(399)$(415)
Non-current liabilities$(18,594)$(32,030)$(2,743)$(3,069)
Schedule of Net Benefit Costs
ABX’s net periodic benefit costs for its defined benefit pension plans and post-retirement healthcare plans for the years ended December 31, 2021, 2020 and 2019, are as follows (in thousands):
 Pension PlansPost-Retirement Healthcare Plan
 202120202019202120202019
Service cost$— $— $— $95 $139 107 
Interest cost22,387 27,880 31,299 42 91 148 
Expected return on plan assets(47,502)(44,673)(37,907)— — — 
Curtailments and settlements— (424)— — (17)— 
Amortization of prior service cost— — — — — — 
Amortization of net (gain) loss7,058 3,763 15,528 186 124 172 
Net periodic benefit cost (income)$(18,057)$(13,454)$8,920 $323 $337 $427 
Schedule of Net Periodic Benefit Cost Not yet Recognized
The pre-tax amounts in accumulated other comprehensive loss that have not yet been recognized as components of net periodic benefit expense at December 31 are as follows (in thousands):
 Pension PlansPost-Retirement
Healthcare Plans
 2021202020212020
Unrecognized prior service cost$— $— $— $— 
Unrecognized net actuarial loss90,675 111,820 418 833 
Accumulated other comprehensive loss$90,675 $111,820 $418 $833 
Schedule of Amounts in Accumulated Other Comprehensive Income (Loss) to be Recognized over Next Fiscal Year The amounts of unrecognized net actuarial loss recorded in accumulated other comprehensive loss that is expected to be recognized as components of net periodic benefit expense during 2022 is $1.3 million and less than $0.1 million for the pension plans and the post-retirement healthcare plans, respectively.
Schedule of Assumptions Used
Assumptions used in determining the funded status of ABX’s pension plans at December 31 were as follows:
 
 Pension Plans
 202120202019
Discount rate - crewmembers2.90%2.55%3.65%
Discount rate - non-crewmembers3.00%2.75%3.70%
Expected return on plan assets5.65%5.75%6.10%
Schedule of Allocation of Plan Assets
The weighted-average asset allocations by asset category are as shown below:
 
 Composition of Plan Assets
as of December 31
Asset category20212020
Cash3 %1 %
Equity securities28 %30 %
Fixed income securities69 %69 %
100 %100 %
The pension plan assets measured at fair value on a recurring basis were as follows (in thousands):
As of December 31, 2021Fair Value Measurement UsingTotal
 Level 1Level 2
Plan assets
Common trust funds$— $29,451 $29,451 
Corporate stock— — — 
Mutual funds— 236,647 236,647 
Fixed income investments— 584,094 584,094 
Benefit Plan Assets$— $850,192 $850,192 
Investments measured at net asset value ("NAV")3 
Total benefit plan assets$850,195 
As of December 31, 2020Fair Value Measurement UsingTotal
 Level 1Level 2
Plan assets
Common trust funds$— $5,055 $5,055 
Corporate stock19,852 501 20,353 
Mutual funds— 237,063 237,063 
Fixed income investments545 580,476 581,021 
Benefit Plan Assets$20,397 $823,095 $843,492 
Investments measured at net asset value ("NAV")403 
Total benefit plan assets$843,895 
Schedule of Expected Benefit Payments
The following benefit payments, which reflect expected future service, as appropriate, are expected to be paid out of the respective plans as follows (in thousands):
 Pension
Benefits		Post-retirement
Healthcare
Benefits
2022$40,186 $399 
202343,474 481 
202445,838 489 
202547,906 483 
202648,747 425 
Years 2027 to 2031246,110 1,134 
Schedule of Level Three Defined Benefit Plan Assets Roll Forward
The following table presents investments measured at fair value based on NAV per share as a practical expedient:
 Fair ValueRedemption FrequencyRedemption Notice PeriodUnfunded Commitments
As of December 31, 2021
Hedge Funds & Private Equity$3 (1) (2)90 days$— 
Real Estate— (3)90 days— 
Total investments measured at NAV$3 $— 
As of December 31, 2020
Hedge Funds & Private Equity$403 (1) (2)90 days$— 
Real Estate— (3)90 days— 
Total investments measured at NAV$403 $—