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Other Noncurrent Liabilities (Tables) | 3 Months Ended
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Mar. 31, 2016
Other Liabilities Disclosure [Abstract] |
Schedule of Other Noncurrent Liabilities | The components of other noncurrent liabilities as of March 31, 2016 and December 31, 2015 were:
| March 31, 2016 |  | December 31, 2015
Pension and retiree medical obligations | $ | 83,128 |  |  | $ | 76,190 |
Liability for uncertain tax positions | 2,623 |  |  | 4,252 |
Deferred revenue | 3,258 |  |  | 3,763 |
Other | 19,253 |  |  | 18,160 |
Total other noncurrent liabilities | $ | 108,262 |  |  | $ | 102,365 |

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