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Commitments and Contingencies (Tables) | 12 Months Ended
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Dec. 31, 2016
Commitments And Contingencies Disclosure [Abstract] |
Changes in Accrued Environmental Remediation and Related Costs | The table below presents a summary of the activity in our accrued environmental costs during the past three years. The amount charged to expense is included in corporate expense on our Consolidated Statements of Operations.
| Years ended December 31, |
| 2014 |  |  | 2015 |  |  | 2016 |
| (In thousands) |
Balance at the beginning of the year | $ | 113,636 |  |  | $ | 110,015 |  |  | $ | 113,133 |
Additions charged to expense, net |  | 6,485 |  |  |  | 4,370 |  |  |  | 5,152 |
Payments, net |  | (10,106 | ) |  |  | (1,252 | ) |  |  | (1,627 | )
Balance at the end of the year | $ | 110,015 |  |  | $ | 113,133 |  |  | $ | 116,658 |
Amounts recognized in the balance sheet: |  |  |  |  |  |  |  |  |  |  |
Current liability | $ | 6,984 |  |  | $ | 8,668 |  |  | $ | 13,350 |
Noncurrent liability |  | 103,031 |  |  |  | 104,465 |  |  |  | 103,308 |
Balance at the end of the year | $ | 110,015 |  |  | $ | 113,133 |  |  | $ | 116,658 |

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