Other Noncurrent Liabilities (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Other Liabilities Disclosure [Abstract]
Pension and retiree medical obligations	$ 86,325	$ 87,478
Transition tax payable	14,208	11,292
Liability for uncertain tax positions	1,071	3,008
Deferred revenue	5,100	2,129
Lease liability	93,507	69,928
Other	23,120	23,533
Total other noncurrent liabilities	$ 223,331	$ 197,368