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Other Noncurrent Liabilities | 9 Months Ended
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Sep. 30, 2021
Other Liabilities Disclosure [Abstract] |
Other Noncurrent Liabilities | Other Noncurrent Liabilities The components of other noncurrent liabilities as of September 30, 2021 and December 31, 2020 were:
| September 30, 2021 |  | December 31, 2020
Pension and retiree medical obligations | $ | 92,308 |  |  | $ | 99,417 |
Transition tax payable | 14,128 |  |  | 14,208 |
Liability for uncertain tax positions | 773 |  |  | 1,071 |
Deferred revenue | 31,025 |  |  | 30,354 |
Lease liability | 96,927 |  |  | 94,250 |
Other | 22,883 |  |  | 27,497 |
Total other noncurrent liabilities | $ | 258,044 |  |  | $ | 266,797 |

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