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Retirement Plans And Postretirement Benefits (Tables)
 12 Months Ended
Dec. 31, 2023
Retirement Benefits, Description [Abstract]  
Components Of Consolidated Net Pension Costs Retirement Plans
The components of our consolidated net pension costs are set forth in the following table:
Year Ended December 31,
202320222021
 U.S.ForeignU.S.ForeignU.S.Foreign
(Dollars in thousands)
Service cost$1,483 $1,053 $1,390 $1,220 $1,328 $1,349 
Interest cost4,722 870 3,242 227 2,962 111 
Expected return on assets(4,353)(1,145)(3,960)(640)(4,213)(545)
Mark-to-market (gain) loss (2,513)4,395 (181)(7,801)(2,428)(1,327)
Net periodic benefit (credit) cost$(661)$5,173 $491 $(6,994)$(2,351)$(412)
Reconciliation Of Pension Plans' Benefit Obligations, Fair Value Of Assets Retirement Plans
The reconciliation of the beginning and ending balances of our pension plans’ benefit obligations, fair value of assets, and funded status at December 31, 2023 and 2022 are shown below.
 
December 31, 2023
December 31, 2022
 U.S.ForeignU.S.Foreign
 (Dollars in thousands)
Changes in Benefit Obligation:
Net benefit obligation at beginning of period$99,993 $31,065 $129,906 $38,571 
Service cost1,483 1,053 1,390 1,220 
Interest cost4,722 870 3,242 227 
Participant contributions— 501 — 557 
Plan settlements— (1,609)— — 
Foreign currency exchange changes— 2,983 — (660)
Actuarial loss (gain)1,516 3,694 (24,202)(7,293)
Benefits paid(10,392)(1,076)(10,343)(1,557)
Net benefit obligation at end of period$97,322 $37,481 $99,993 $31,065 
Changes in Plan Assets:
Fair value of plan assets at beginning of period$80,006 $27,708 $109,961 $26,913 
Actual return on plan assets8,382 645 (20,061)1,148 
Foreign currency exchange rate changes— 2,609 — (325)
Plan settlements— (1,609)— — 
Employer contributions400 1,203 449 972 
Participant contributions— 501 — 557 
Benefits paid(10,392)(1,076)(10,343)(1,557)
Fair value of plan assets at end of period$78,396 $29,981 $80,006 $27,708 
Funded status (underfunded):$(18,926)$(7,500)$(19,987)$(3,357)
Amounts recognized in the statement
  of financial position:
Other accrued liabilities$(324)$(34)$(409)$(167)
Other long-term obligations(18,602)(7,466)(19,578)(3,190)
Net amount recognized$(18,926)$(7,500)$(19,987)$(3,357)
Assumptions Used To Determine Net Pension Costs And Projected Benefit Obligations Assumptions used to determine net pension costs and projected benefit obligations are:
Pension Benefit Obligations Key AssumptionsDecember 31,
 20232022
Weighted average assumptions to determine benefit obligations:
Discount rate3.93 %4.43 %
Rate of compensation increase1.70 %1.71 %
 
Pension Cost Key Assumptions
Weighted average assumptions to determine net cost:
Discount rate4.43 %2.14 %
Expected return on plan assets5.30 %3.50 %
Rate of compensation increase1.71 %1.46 %
Retirement Plan Weighted Average Asset Allocations The following table presents our retirement plan weighted average asset allocations at December 31, 2023, by asset category:
 
Percentage of Plan Assets
 December 31, 2023
 U.S.Foreign
Equity securities and return seeking assets20 %— %
Fixed income, debt securities, or cash80 %100 %
Total100 %100 %
Pension Plans With An Accumulated Benefit Obligation In Excess Of Plan Assets
Information for our pension plans with an accumulated benefit obligation in excess of plan assets at December 31, 2023 and 2022 follows:
 20232022
 U.S.ForeignU.S.Foreign
 (Dollars in thousands)
Accumulated benefit obligation$97,322 $35,772 $99,993 $1,884 
Fair value of plan assets78,396 29,981 80,006 — 
Pension Plans With Projected Benefit Obligation In Excess Of Plan Assets
Information for our pension plans with a projected benefit obligation in excess of plan assets at December 31, 2023 and 2022 follows:
 20232022
 U.S.ForeignU.S.Foreign
 (Dollars in thousands)
Projected benefit obligation$97,322 $37,481 $99,993 $31,065 
Fair value of plan assets78,396 29,981 80,006 27,708 
Schedule of Effect of Significant Unobservable Inputs, Changes in Plan Assets
The following table presents the changes for those financial instruments classified within Level 3 of the valuation hierarchy for international plan pension assets for the years ended December 31, 2023 and 2022 (dollars in thousands):
Fixed Insurance
Contracts
Balance at December 31, 2021
$26,003 
   Gain / contributions / currency impact864 
   Distributions(182)
Balance at December 31, 2022
26,685 
   Gain / contributions / currency impact2,489 
   Distributions(154)
Balance at December 31, 2023
$29,020 
Schedule of Allocation of Plan Assets
The fair value of other plan assets by category is summarized below (dollars in thousands):
 December 31, 2023
Level 1Level 2Level 3Total
U.S. Plan Assets
Cash and cash equivalents$710 $— $— $710 
International Plan Assets
Foreign government bonds— 961 — 961 
Fixed insurance contracts— — 29,020 29,020 
Total international plan assets$— $961 $29,020 $29,981 
U.S. Plan - Investments measured at net asset value$77,686 
Total$710 $961 $29,020 $108,377 
December 31, 2022
Level 1Level 2Level 3Total
U.S. Plan Assets
Cash and cash equivalents$706 $— $— $706 
International Plan Assets
Foreign government bonds$— $1,023 $— $1,023 
Fixed insurance contracts— — 26,685 26,685 
Total international plan assets$— $1,023 $26,685 $27,708 
U.S. Plan - Investments measured at net asset value$79,300 
Total$706 $1,023 $26,685 $107,714 
Schedule of Expected Benefit Payments
Following is our projected future pension plan cash flow by year:
U.S.Foreign
 (Dollars in thousands)
Expected contributions in 2024:
Expected employer contributions$4,709 $677 
Expected employee contributions— — 
Estimated future benefit payments reflecting expected future service for the years ending December 31:
2024$9,021 $3,152 
20258,912 1,411 
20268,826 2,673 
20278,596 2,177 
20288,379 1,723 
Next five years37,440 11,850