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Employee benefit plans (Tables)

9 Months Ended

Sep. 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 September 30,			2021			2020			2021			2020
			(In thousands)
Components of net periodic benefit credit:
Service cost			$	—		$	—		$	400		$	383
Interest cost			2,455			3,023			466			609
Expected return on assets			(4,894)			(4,987)			(1,275)			(1,115)
Amortization of prior service credit			—			—			(349)			(349)
Amortization of net actuarial loss			2,004			1,793			6			71
Net periodic benefit credit, including amount capitalized			(435)			(171)			(752)			(401)
Less amount capitalized			—			—			46			39
Net periodic benefit credit			$	(435)		$	(171)		$	(798)		$	(440)



			Pension Benefits						Other Postretirement Benefits
Nine Months Ended September 30,			2021			2020			2021			2020
			(In thousands)
Components of net periodic benefit credit:
Service cost			$	—		$	—		$	1,200		$	1,149
Interest cost			7,365			9,070			1,398			1,827
Expected return on assets			(14,682)			(14,962)			(3,825)			(3,764)
Amortization of prior service credit			—			—			(1,047)			(1,048)
Amortization of net actuarial loss			6,012			5,379			18			215
Net periodic benefit credit, including amount capitalized			(1,305)			(513)			(2,256)			(1,621)
Less amount capitalized			—			—			129			106
Net periodic benefit credit			$	(1,305)		$	(513)		$	(2,385)		$	(1,727)