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Other Noncurrent Liabilities (Tables) | 6 Months Ended
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Jun. 30, 2021
Other Liabilities Disclosure [Abstract] |
Summary of Other Noncurrent Liabilities |
| December 31, |  |  | June 30, |
| 2020 |  |  | 2021 |
| (In thousands) |
Reserve for uncertain tax positions | $ | 1,717 |  |  | $ | 1,717 |
OPEB |  | 985 |  |  |  | 878 |
Insurance claims and expenses |  | 653 |  |  |  | 617 |
Other |  | 425 |  |  |  | 425 |
Total | $ | 3,780 |  |  | $ | 3,637 |

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