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Other Noncurrent Liabilities
 9 Months Ended
Sep. 30, 2017
Other Liabilities Disclosure [Abstract]  
Other Noncurrent Liabilities
Other Noncurrent Liabilities
The components of other noncurrent liabilities as of September 30, 2017 and December 31, 2016 were:
 
 
September 30,
2017
 
December 31,
2016
Pension and retiree medical obligations
$
100,356

 
$
93,604

Liability for uncertain tax positions
1,507

 
2,623

Deferred revenue
2,205

 
2,442

Other
18,869

 
22,561

Total other noncurrent liabilities
$
122,937

 
$
121,230