Other Noncurrent Liabilities (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018	Jan. 01, 2018
Other Liabilities Disclosure [Abstract]
Pension and retiree medical obligations	$ 76,186	$ 80,667
Transition tax payable	17,127	17,127
Liability for uncertain tax positions	3,218	3,183
Deferred revenue	2,789	3,027	$ 3,027
Liability for construction of new leased facility	0	11,616
Lease liability	54,968	0
Contingent consideration for acquisition	3,375	3,375
Other	20,000	19,219
Total other noncurrent liabilities	$ 177,663	$ 138,214