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Stockholders' Equity (Tables) | 12 Months Ended
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Dec. 31, 2021
Stockholders Equity Note [Abstract] |
Schedule of Changes in Accumulated Other Comprehensive Loss | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Years ended December 31,
​ |  | 2019 |  | 2020 |  | 2021
​ | ​ | (In thousands)
Accumulated other comprehensive loss, net of tax: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Currency translation: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Balance at beginning of period | ​ | $ | (172,434) | ​ | $ | (172,843) | ​ | $ | (169,575)
Other comprehensive income (loss) | ​ |  | (409) | ​ |  | 3,268 | ​ |  | (1,660)
Balance at end of period | ​ | $ | (172,843) | ​ | $ | (169,575) | ​ | $ | (171,235)
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Defined benefit pension plans: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Balance at beginning of period | ​ | $ | (75,286) | ​ | $ | (78,257) | ​ | $ | (80,704)
Other comprehensive income (loss): | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Amortization of prior service cost and net losses included in net periodic pension cost | ​ |  | 3,539 | ​ |  | 4,330 | ​ |  | 4,813
Net actuarial gain (loss) arising during the year | ​ |  | (6,510) | ​ |  | (6,777) | ​ |  | 7,423
Balance at end of period | ​ | $ | (78,257) | ​ | $ | (80,704) | ​ | $ | (68,468)
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
OPEB plans: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Balance at beginning of period | ​ | $ | (550) | ​ | $ | (590) | ​ | $ | (910)
Other comprehensive loss - amortization of net gains included in net periodic OPEB cost | ​ |  | (40) | ​ |  | (320) | ​ |  | (143)
Balance at end of period | ​ | $ | (590) | ​ | $ | (910) | ​ | $ | (1,053)
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Total accumulated other comprehensive loss: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Balance at beginning of period | ​ | $ | (248,270) | ​ | $ | (251,690) | ​ | $ | (251,189)
Other comprehensive income (loss) | ​ |  | (3,420) | ​ |  | 501 | ​ |  | 10,433
Balance at end of period | ​ | $ | (251,690) | ​ | $ | (251,189) | ​ | $ | (240,756)

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