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Other Noncurrent Liabilities | 3 Months Ended
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Mar. 31, 2014
Other Liabilities Disclosure [Abstract] |
Other Noncurrent Liabilities | Other Noncurrent Liabilities The components of Other noncurrent liabilities as of March 31, 2014 and December 31, 2013 were:
| March 31, 2014 |  | December 31, 2013
Pension and retiree medical obligations | $ | 67,731 |  |  | $ | 67,777 |
Liability for uncertain tax positions | 3,017 |  |  | 4,624 |
Deferred revenue | 5,184 |  |  | 5,578 |
Other | 15,416 |  |  | 15,087 |
Total other noncurrent liabilities | $ | 91,348 |  |  | $ | 93,066 |

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