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Other Noncurrent Liabilities | 6 Months Ended
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Jun. 30, 2017
Other Liabilities Disclosure [Abstract] |
Other Noncurrent Liabilities | Other Noncurrent Liabilities The components of other noncurrent liabilities as of June 30, 2017 and December 31, 2016 were:
| June 30, 2017 |  | December 31, 2016
Pension and retiree medical obligations | $ | 100,762 |  |  | $ | 93,604 |
Liability for uncertain tax positions | 1,872 |  |  | 2,623 |
Deferred revenue | 2,167 |  |  | 2,442 |
Other | 18,076 |  |  | 22,561 |
Total other noncurrent liabilities | $ | 122,877 |  |  | $ | 121,230 |

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