Stockholders Equity (Tables)

3 Months Ended

Mar. 31, 2022

Stockholders Equity Note [Abstract]

Schedule of Changes in Accumulated Other Comprehensive Loss

	Three months ended
	March 31,
	2021		2022
	(In thousands)
Accumulated other comprehensive loss, net of tax:
Currency translation:
Balance at beginning of period	$	(169,575)	$	(171,235)
Other comprehensive income		545		1,580
Balance at end of period	$	(169,030)	$	(169,655)
Defined benefit pension plans:
Balance at beginning of period	$	(80,704)	$	(68,468)
Other comprehensive income		1,151		873
Balance at end of period	$	(79,553)	$	(67,595)
OPEB plans:
Balance at beginning of period	$	(910)	$	(1,053)
Other comprehensive loss - amortization of net   gains included in net periodic OPEB cost		(71)		(68)
Balance at end of period	$	(981)	$	(1,121)
Total accumulated other comprehensive loss:
Balance at beginning of period	$	(251,189)	$	(240,756)
Other comprehensive income		1,625		2,385
Balance at end of period	$	(249,564)	$	(238,371)