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Employee Benefit Plans
 6 Months Ended
Jun. 30, 2025
Retirement Benefits [Abstract]  
Pension and Other Postretirement Benefits Disclosure [Text Block] Employee Benefit Plans
 
We sponsor and/or contribute to pension and postretirement health care and life insurance benefit plans for eligible employees. Net periodic benefit cost (credit) for our pension and other postretirement plans consists of the following (in thousands):
 Pension BenefitsOther Postretirement Benefits
 Three Months Ended June 30,Three Months Ended June 30,
 2025202420252024
Components of Net Periodic Benefit Cost (Credit)    
Service cost$1,167 $1,378 $66 $74 
Interest cost6,104 5,739 129 132 
Expected return on plan assets(5,734)(6,335)(355)(321)
Amortization of prior service credit— — — — 
Recognized actuarial loss (gain)— 6 (68)(25)
Net periodic benefit cost (credit)$1,537 $788 $(228)$(140)

 Pension BenefitsOther Postretirement Benefits
 Six Months Ended June 30,Six Months Ended June 30,
 2025202420252024
Components of Net Periodic Benefit Cost (Credit)    
Service cost$2,362 $2,796 $128 $154 
Interest cost12,149 11,472 256 279 
Expected return on plan assets(11,476)(12,663)(709)(640)
Amortization of prior service credit— — — — 
Recognized actuarial loss (gain)— 17 (138)(37)
Net periodic benefit cost (credit)$3,035 $1,622 $(463)$(244)
We contributed $4.2 million to our pension plans during the six months ended June 30, 2025. We expect to contribute an additional $5.8 million to our pension plans during the remainder of 2025.