Other Noncurrent Liabilities (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Other Liabilities Disclosure [Abstract]
Pension and retiree medical obligations	$ 72,731	$ 80,667
Transition tax payable	17,127	17,127
Liability for uncertain tax positions	3,286	3,183
Deferred revenue	2,369	3,027
Liability for construction of new leased facility	0	11,616
Lease liability	53,284	0
Contingent consideration for acquisition	0	3,375
Other	20,630	19,219
Total other noncurrent liabilities	$ 169,427	$ 138,214