Years ended December 31,

 

2023

 

2024

 

2025

(In thousands)

Accumulated other comprehensive loss, net of tax:

Currency translation:

Balance at beginning of period

$

(178,191)

$

(177,119)

$

(185,423)

Other comprehensive income (loss)

1,072

(8,304)

7,911

Balance at end of period

$

(177,119)

$

(185,423)

$

(177,512)

Defined benefit pension plans:

Balance at beginning of period

$

(43,857)

$

(41,373)

$

(36,666)

Other comprehensive income (loss):

Amortization of prior service cost and net losses included in
net periodic pension cost

1,436

1,504

1,275

Net actuarial gain (loss) arising during the year

(3,094)

3,134

742

Plan settlement

4,142

69

17,290

Balance at end of period

$

(41,373)

$

(36,666)

$

(17,359)

OPEB plans:

Balance at beginning of period

$

(893)

$

(1,114)

$

(1,267)

Other comprehensive income (loss):

Amortization of net gain included in net periodic
OPEB cost

(357)

(195)

(138)

Net actuarial gain arising during the year

136

42

209

Balance at end of period

$

(1,114)

$

(1,267)

$

(1,196)

Marketable debt securities:

Balance at beginning of period

$

(50)

$

(15)

$

—

Other comprehensive income - unrealized gain
arising during the period

35

15

—

Balance at end of period

$

(15)

$

—

$

—

Total accumulated other comprehensive loss:

Balance at beginning of period

$

(222,991)

$

(219,621)

$

(223,356)

Other comprehensive income (loss)

3,370

(3,735)

27,289

Balance at end of period

$

(219,621)

$

(223,356)

$

(196,067)