Commitments and contingencies (Tables)

12 Months Ended

Dec. 31, 2025

Commitments and contingencies.

Schedule of Changes in Accrued Environmental Remediation and Related Costs

	Years ended December 31,
	2023		2024		2025
	(In thousands)
Balance at the beginning of the period	$	92,358	$	91,106	$	69,278
Additions (deductions), net		558		(20,286)		1,885
Payments, net		(1,810)		(1,542)		(58,123)
Balance at the end of the period	$	91,106	$	69,278	$	13,040
Amounts recognized in the balance sheet:
Current liability	$	1,655	$	58,135	$	2,071
Noncurrent liability		89,451		11,143		10,969
Balance at the end of the period	$	91,106	$	69,278	$	13,040