Stockholders' equity (Tables)

3 Months Ended

Mar. 31, 2023

Stockholders' equity

Schedule of Changes in Accumulated Other Comprehensive Loss

	Three months ended
	March 31,
	2022		2023
	(In thousands)
Accumulated other comprehensive loss, (net of tax and noncontrolling interest):
Currency translation:
Balance at beginning of period	$	(171,235)	$	(178,191)
Other comprehensive income (loss)		1,580		(1,666)
Balance at end of period	$	(169,655)	$	(179,857)
Defined benefit pension plans:
Balance at beginning of period	$	(68,468)	$	(43,857)
Other comprehensive income -
Amortization of prior service cost and net losses included in   net periodic pension cost		873		393
Balance at end of period	$	(67,595)	$	(43,464)
OPEB plans and other:
Balance at beginning of period	$	(1,053)	$	(893)
Other comprehensive loss -
Amortization of net gain included in net periodic   OPEB cost		(68)		(60)
Balance at end of period	$	(1,121)	$	(953)
Marketable debt securities:
Balance at beginning of period	$	—	$	(50)
Other comprehensive loss - unrealized loss arising during the period		—		(44)
Balance at end of period	$	—	$	(94)
Total accumulated other comprehensive loss:
Balance at beginning of period	$	(240,756)	$	(222,991)
Other comprehensive income (loss)		2,385		(1,377)
Balance at end of period	$	(238,371)	$	(224,368)