Commitments and Contingencies Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Commitments And Contingencies Disclosure [Line Items]
Total future minimum operating lease payments	$ 13,923	$ 10,804
Property, plant and equipment, gross	71,137	85,226
Accumulated depreciation and amortization	54,591	61,678
Payments for Environmental Liabilities	1,300
Finance Lease, Liability, Payments, Due	657	5,092
McCook facility
Commitments And Contingencies Disclosure [Line Items]
Property, plant and equipment, gross	0	12,961
Capital leases
Commitments And Contingencies Disclosure [Line Items]
Property, plant and equipment, gross	$ 0	$ 684