Other Noncurrent Liabilities (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Other Liabilities Disclosure [Abstract]
Pension and retiree medical obligations	$ 83,915	$ 87,478
Transition tax payable	13,750	11,292
Liability for uncertain tax positions	1,071	3,008
Deferred revenue	1,615	2,129
Lease liability	94,503	69,928
Other	21,532	23,533
Total other noncurrent liabilities	$ 216,386	$ 197,368