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Commitments and Contingencies (Tables) | 12 Months Ended
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Dec. 31, 2021
Commitments And Contingencies Disclosure [Abstract] |
Changes in Accrued Environmental Remediation and Related Costs | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Years ended December 31,
​ |  | 2019 |  | 2020 |  | 2021
​ | ​ | (In thousands)
Balance at the beginning of the period | ​ | $ | 98,211 | ​ | $ | 94,508 | ​ | $ | 93,416
Additions charged (credited) to expense, net | ​ |  | (579) | ​ |  | 82 | ​ |  | 788
Payments, net | ​ |  | (3,124) | ​ |  | (1,174) | ​ |  | (1,264)
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Balance at the end of the year | ​ | $ | 94,508 | ​ | $ | 93,416 | ​ | $ | 92,940
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Amounts recognized in the balance sheet: | ​ |  |  | ​ |  |  | ​ |  |
Current liability | ​ | $ | 3,065 | ​ | $ | 2,027 | ​ | $ | 2,643
Noncurrent liability | ​ |  | 91,443 | ​ |  | 91,389 | ​ |  | 90,297
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Balance at the end of the period | ​ | $ | 94,508 | ​ | $ | 93,416 | ​ | $ | 92,940

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