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

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Three months ended

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Six months ended

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June 30, 

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June 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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​

​

​

​

​

​

​

​

​

​

Currency translation:

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​

​

​

​

​

​

​

​

​

​

​

Balance at beginning of period

​

$

(169,655)

​

$

(179,857)

​

$

(171,235)

​

$

(178,191)

Other comprehensive loss

​

 

(8,741)

​

 

(1,219)

​

 

(7,161)

​

 

(2,885)

Balance at end of period

​

$

(178,396)

​

$

(181,076)

​

$

(178,396)

​

$

(181,076)

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​

​

​

​

​

​

​

​

​

​

​

​

Defined benefit pension plans:

​

​

​

​

​

​

​

​

​

​

​

​

Balance at beginning of period

​

$

(67,595)

​

$

(43,464)

​

$

(68,468)

​

$

(43,857)

Other comprehensive income -

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​

​

​

​

​

​

​

​

​

​

​

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

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856

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534

​

 

1,729

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927

Plan settlement

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—

​

 

4,142

​

 

—

​

 

4,142

Balance at end of period

​

$

(66,739)

​

$

(38,788)

​

$

(66,739)

​

$

(38,788)

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​

​

​

​

​

​

​

​

​

​

​

​

OPEB plans and other:

​

​

​

​

​

​

​

​

​

​

​

​

Balance at beginning of period

​

$

(1,121)

​

$

(953)

​

$

(1,053)

​

$

(893)

Other comprehensive loss -

​

​

​

​

​

​

​

​

​

​

​

​

Amortization of net gain included in net periodic
  OPEB cost

​

 

(63)

​

 

(58)

​

 

(131)

​

 

(118)

Balance at end of period

​

$

(1,184)

​

$

(1,011)

​

$

(1,184)

​

$

(1,011)

​

​

​

​

​

​

​

​

​

​

​

​

​

Marketable debt securities:

​

​

​

​

​

​

​

​

​

​

​

​

Balance at beginning of period

​

$

—

​

$

(94)

​

$

—

​

$

(50)

Other comprehensive loss - unrealized loss arising during
  the period

​

​

—

​

​

(129)

​

 

—

​

 

(173)

Balance at end of period

​

$

—

​

$

(223)

​

$

—

​

$

(223)

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​

​

​

​

​

​

​

​

​

​

​

​

Total accumulated other comprehensive loss:

​

​

​

​

​

​

​

​

​

​

​

​

Balance at beginning of period

​

$

(238,371)

​

$

(224,368)

​

$

(240,756)

​

$

(222,991)

Other comprehensive income (loss)

​

​

(7,948)

​

​

3,270

​

​

(5,563)

​

​

1,893

Balance at end of period

​

$

(246,319)

​

$

(221,098)

​

$

(246,319)

​

$

(221,098)