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Other Noncurrent Liabilities | 6 Months Ended
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Jun. 30, 2015
Other Liabilities Disclosure [Abstract] |
Other Noncurrent Liabilities | Other Noncurrent Liabilities The components of other noncurrent liabilities as of June 30, 2015 and December 31, 2014 were:
| June 30, 2015 |  | December 31, 2014
Pension and retiree medical obligations | $ | 87,101 |  |  | $ | 90,584 |
Liability for uncertain tax positions | 4,064 |  |  | 2,471 |
Deferred revenue | 3,692 |  |  | 4,612 |
Other | 18,399 |  |  | 16,610 |
Total other noncurrent liabilities | $ | 113,256 |  |  | $ | 114,277 |

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