Restructuring and Related Activities	12 Months Ended
	Dec. 31, 2020
Realignment Actions [Abstract]
Restructuring, Impairment, and Other Activities Disclosure [Text Block]	Realignment ActionsDuring 2020, the Company executed certain realignment actions, primarily in its Aerospace and Specialty Products segments, in response to reductions in current and expected future end-market demand. The Company recorded non-cash charges of approximately $13.8 million related to inventory reductions, primarily as a result of a strategic decision in its Arrow Engine division to narrow its product line focus. The Company also recorded non-cash charges of approximately $2.3 million related to certain production equipment removed from service given reduced demand levels. In addition, the Company reduced its employment levels given lower customer demand, incurring approximately $3.8 million in severance charges, of which approximately $3.7 million was paid by December 31, 2020. During 2020, approximately $17.1 million of these charges were included in cost of sales and approximately $2.8 million were included in selling, general and administrative expenses in the accompanying consolidated statement of operations.