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Other Noncurrent Liabilities (Tables) | 9 Months Ended
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Sep. 30, 2017
Other Liabilities Disclosure [Abstract] |
Schedule of Other Noncurrent Liabilities | The components of other noncurrent liabilities as of September 30, 2017 and December 31, 2016 were:
| September 30, 2017 |  | December 31, 2016
Pension and retiree medical obligations | $ | 100,356 |  |  | $ | 93,604 |
Liability for uncertain tax positions | 1,507 |  |  | 2,623 |
Deferred revenue | 2,205 |  |  | 2,442 |
Other | 18,869 |  |  | 22,561 |
Total other noncurrent liabilities | $ | 122,937 |  |  | $ | 121,230 |

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