Commitments and contingencies (Tables)

12 Months Ended

Dec. 31, 2024

Commitments and contingencies.

Schedule of Changes in Accrued Environmental Remediation and Related Costs

	Years ended December 31,
	2022		2023		2024
	(In thousands)
Balance at the beginning of the period	$	92,940	$	92,358	$	91,106
Additions (deductions), net		486		558		(20,286)
Payments, net		(1,068)		(1,810)		(1,542)
Balance at the end of the period	$	92,358	$	91,106	$	69,278
Amounts recognized in the balance sheet:
Current liability	$	2,627	$	1,655	$	58,135
Noncurrent liability		89,731		89,451		11,143
Balance at the end of the period	$	92,358	$	91,106	$	69,278