Other Noncurrent Liabilities (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Other Liabilities Disclosure [Abstract]
Pension and retiree medical obligations	$ 82,543	$ 87,478
Transition tax payable	11,292	11,292
Liability for uncertain tax positions	3,629	3,008
Deferred revenue	1,850	2,129
Lease liability	80,802	69,928
Other	19,675	23,533
Total other noncurrent liabilities	$ 199,791	$ 197,368