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Employee benefit plans (Tables)

6 Months Ended

Jun. 30, 2021

Retirement Benefits [Abstract]

Schedule of net benefit costs

Components of net periodic benefit credit for the Company's pension and other postretirement benefit plans were as follows:


			Pension Benefits						Other Postretirement Benefits
Three Months Ended June 30,			2021			2020			2021			2020
			(In thousands)
Components of net periodic benefit credit:
Service cost			$	—		$	—		$	400		$	414
Interest cost			2,455			3,074			466			627
Expected return on assets			(4,894)			(5,214)			(1,275)			(1,401)
Amortization of prior service credit			—			—			(349)			(402)
Amortization of net actuarial loss			2,004			1,723			6			142
Net periodic benefit credit, including amount capitalized			(435)			(417)			(752)			(620)
Less amount capitalized			—			—			44			35
Net periodic benefit credit			$	(435)		$	(417)		$	(796)		$	(655)



			Pension Benefits						Other Postretirement Benefits
Six Months Ended June 30,			2021			2020			2021			2020
			(In thousands)
Components of net periodic benefit credit:
Service cost			$	—		$	—		$	800		$	766
Interest cost			4,910			6,047			932			1,218
Expected return on assets			(9,788)			(9,975)			(2,550)			(2,649)
Amortization of prior service credit			—			—			(698)			(699)
Amortization of net actuarial loss			4,008			3,586			12			144
Net periodic benefit credit, including amount capitalized			(870)			(342)			(1,504)			(1,220)
Less amount capitalized			—			—			83			67
Net periodic benefit credit			$	(870)		$	(342)		$	(1,587)		$	(1,287)