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Employee Benefit Plans (Tables)
 6 Months Ended
Jun. 30, 2025
Retirement Benefits [Abstract]  
Schedule of Defined Benefit Plans Disclosures [Table Text Block] 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)