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Stockholders' equity (Tables)
9 Months Ended
Sep. 30, 2023
Stockholders' equity  
Schedule of Changes in Accumulated Other Comprehensive Loss

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Three months ended

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Nine months ended

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September 30, 

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September 30, 

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2022

    

2023

    

2022

    

2023

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(In thousands)

Accumulated other comprehensive loss, (net of tax and
  noncontrolling interest):

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​

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​

Currency translation:

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​

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​

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​

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​

Balance at beginning of period

​

$

(178,396)

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$

(181,076)

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$

(171,235)

​

$

(178,191)

Other comprehensive loss

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(6,233)

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(345)

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(13,394)

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(3,230)

Balance at end of period

​

$

(184,629)

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$

(181,421)

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$

(184,629)

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$

(181,421)

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​

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​

​

​

​

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​

Defined benefit pension plans:

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​

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​

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Balance at beginning of period

​

$

(66,739)

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$

(38,788)

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$

(68,468)

​

$

(43,857)

Other comprehensive income -

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​

​

​

​

​

​

​

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

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828

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392

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2,557

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1,319

Plan settlement

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—

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—

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—

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4,142

Balance at end of period

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$

(65,911)

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$

(38,396)

​

$

(65,911)

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$

(38,396)

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​

​

​

​

OPEB plans:

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​

​

​

​

​

​

​

​

​

​

​

Balance at beginning of period

​

$

(1,184)

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$

(1,011)

​

$

(1,053)

​

$

(893)

Other comprehensive loss -

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​

​

​

​

​

​

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​

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Amortization of net gain included in net periodic
  OPEB cost

​

 

(62)

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(57)

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(193)

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(175)

Balance at end of period

​

$

(1,246)

​

$

(1,068)

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$

(1,246)

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$

(1,068)

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​

​

​

​

​

​

​

​

​

​

​

Marketable debt securities:

​

​

​

​

​

​

​

​

​

​

​

​

Balance at beginning of period

​

$

—

​

$

(223)

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$

—

​

$

(50)

Other comprehensive income (loss) - unrealized gain (loss)
arising during the period

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—

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​

81

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—

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(92)

Balance at end of period

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$

—

​

$

(142)

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$

—

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$

(142)

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​

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​

​

Total accumulated other comprehensive loss:

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​

​

​

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​

Balance at beginning of period

​

$

(246,319)

​

$

(221,098)

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$

(240,756)

​

$

(222,991)

Other comprehensive income (loss)

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​

(5,467)

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​

71

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(11,030)

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​

1,964

Balance at end of period

​

$

(251,786)

​

$

(221,027)

​

$

(251,786)

​

$

(221,027)