Revenue Recognition (Summary of Revenue) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Disaggregation Of Revenue [Line Items]
Net sales	$ 37,169	$ 37,434	$ 112,709	$ 148,407
Specialty Alloys [Member]
Disaggregation Of Revenue [Line Items]
Net sales	30,973	27,847	92,359	116,869
Premium Alloys [Member]
Disaggregation Of Revenue [Line Items]
Net sales	5,936	9,165	19,383	29,271
Conversion Services and Other Sales [Member]
Disaggregation Of Revenue [Line Items]
Net sales	$ 260	$ 422	$ 967	$ 2,267