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Other Noncurrent Liabilities
 3 Months Ended
Mar. 31, 2021
Other Liabilities Disclosure [Abstract]  
Other Noncurrent Liabilities Other Noncurrent Liabilities
The components of other noncurrent liabilities as of March 31, 2021 and December 31, 2020 were:
March 31,
2021		December 31,
2020
Pension and retiree medical obligations$84,831 $99,417 
Transition tax payable14,208 14,208 
Liability for uncertain tax positions1,429 1,071 
Deferred revenue36,531 30,354 
Lease liability92,083 94,250 
Other26,288 27,497 
Total other noncurrent liabilities$255,370 $266,797