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Commitments and Contingencies (Tables) | 6 Months Ended
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Jun. 30, 2021
Commitments And Contingencies Disclosure [Abstract] |
Changes in Accrued Environmental Remediation and Related Costs | Changes in the accrued environmental remediation and related costs during the first six months of 2021 are as follows:
| Amount |
| (In thousands) |
Balance at the beginning of the period | $ | 93,416 |
Additions charged to expense, net |  | 211 |
Payments, net |  | (716 | )
Balance at the end of the period | $ | 92,911 |
Amounts recognized in the Condensed Consolidated |  |  |
Balance Sheet at the end of the period: |  |  |
Current liability | $ | 2,257 |
Noncurrent liability |  | 90,654 |
Balance at the end of the period | $ | 92,911 |

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