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Other Noncurrent Liabilities | 9 Months Ended
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Sep. 30, 2016
Other Liabilities Disclosure [Abstract] |
Other Noncurrent Liabilities | Other Noncurrent Liabilities The components of other noncurrent liabilities as of September 30, 2016 and December 31, 2015 were:
| September 30, 2016 |  | December 31, 2015
Pension and retiree medical obligations | $ | 98,422 |  |  | $ | 76,190 |
Liability for uncertain tax positions | 3,030 |  |  | 4,252 |
Deferred revenue | 1,828 |  |  | 3,763 |
Other | 16,795 |  |  | 18,160 |
Total other noncurrent liabilities | $ | 120,075 |  |  | $ | 102,365 |

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