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Employee benefit plans (Tables)
 3 Months Ended
Mar. 31, 2023
Retirement Benefits [Abstract]  
Schedule of net benefit costs
Components of net periodic benefit credit for the Company's pension benefit plans were as follows:
Three Months Ended
March 31,
20232022
(In thousands)
Components of net periodic benefit credit:
Interest cost$3,789 $2,631 
Expected return on assets(4,749)(4,864)
Amortization of net actuarial loss901 1,671 
Net periodic benefit credit$(59)$(562)
Components of net periodic benefit credit for the Company's other postretirement benefit plans were as follows:
Three Months Ended
March 31,
20232022
(In thousands)
Components of net periodic benefit credit:
Service cost$227 $354 
Interest cost670 474 
Expected return on assets(1,341)(1,322)
Amortization of prior service credit
(350)(350)
Amortization of net actuarial gain(213)(54)
Net periodic benefit credit, including amount capitalized(1,007)(898)
Less amount capitalized24 31 
Net periodic benefit credit$(1,031)$(929)