Segment Information Segment Information (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Segment Reporting Information [Line Items]
Net sales	$ 237,680	$ 218,990	$ 461,990	$ 425,720
Operating profit (loss)	29,870	25,570	51,800	46,680
Operating Segments [Member] | Packaging [Member]
Segment Reporting Information [Line Items]
Net sales	148,350	139,630	286,840	271,720
Operating profit (loss)	27,800	27,850	49,130	49,150
Operating Segments [Member] | Aerospace [Member]
Segment Reporting Information [Line Items]
Net sales	47,390	44,560	91,910	89,170
Operating profit (loss)	2,750	2,120	4,590	6,620
Operating Segments [Member] | Specialty Products [Member]
Segment Reporting Information [Line Items]
Net sales	41,940	34,800	83,240	64,830
Operating profit (loss)	6,770	6,010	14,010	10,530
Corporate, Non-Segment [Member]
Segment Reporting Information [Line Items]
Operating profit (loss)	$ (7,450)	$ (10,410)	$ (15,930)	$ (19,620)