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Employee Benefit Plans (Tables)
9 Months Ended
Sep. 30, 2024
Retirement Benefits [Abstract]  
Schedule of Components of Net Periodic Benefit Costs Components of net periodic benefit (income) cost for the Company's defined benefit plans were as follows (in thousands):
 Three months endedNine months ended
September 30,
2024
September 30,
2023
September 30,
2024
September 30,
2023
Pension and SERPA Benefits:
Service cost$1,175 $1,294 $3,525 $3,882 
Interest cost20,118 20,476 60,355 61,429 
Expected return on plan assets(33,143)(36,519)(99,429)(109,557)
Amortization of unrecognized:
Prior service cost
188 188 564 564 
Net gain
(163)(181)(489)(543)
Settlement gain
— — — (222)
Special retirement benefit cost
— — 1,722 — 
Net periodic benefit income$(11,825)$(14,742)$(33,752)$(44,447)
Postretirement Healthcare Benefits:
Service cost$723 $797 $2,169 $2,390 
Interest cost2,694 2,772 8,082 8,316 
Expected return on plan assets(4,424)(4,281)(13,272)(12,843)
Amortization of unrecognized:
Prior service cost (credit)
149 (166)447 (498)
Net gain
(1,250)(1,097)(3,750)(3,291)
Net periodic benefit income$(2,108)$(1,975)$(6,324)$(5,926)