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Retirement Plans
 6 Months Ended
Jun. 30, 2025
Retirement Benefits [Abstract]  
Retirement Plans Retirement Plans
The funded status of our defined benefit plans, which represents the difference between the fair value of plan assets and the projected benefit obligations, is recognized in the Consolidated Balance Sheets with a corresponding adjustment to accumulated other comprehensive income (loss). Gains and losses for the differences between actuarial assumptions and actual results are recognized through accumulated other comprehensive income (loss). These amounts will be subsequently recognized as net periodic pension income within the Consolidated Statements of Operations.
Our United Kingdom subsidiary has a defined benefit pension plan covering all eligible employees (the “UK Plan”); however, no individual joining the company after October 31, 2001 may participate in the UK Plan. On May 31, 2010, we curtailed the future accrual of benefits for active employees under such plan.
We also sponsor three domestic retirement plans in which participation by new individuals is frozen. Amounts related to these domestic retirement plans were de minimis for all periods presented.
Components of Net Periodic Pension Income
The components of net periodic pension income of the UK Plan for the three and six months ended June 30, 2025 and 2024 were as follows (in thousands): 
 
For the three months ended
June 30,
For the six months ended
June 30,
 2025202420252024
Interest cost$2,552 $2,362 $4,968 $4,738 
Expected return on plan assets(3,268)(3,213)(6,362)(6,445)
Amortization of unrecognized loss690 648 1,343 1,301 
Net periodic pension income
$(26)$(203)$(51)$(406)