Operating Segments and Related Information (Details 2) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Business Unit Reporting, Revenue Reconciling Item [Line Items]
Revenue	$ 467,313	$ 450,923
Earnings from operations	52,462	28,495
Defense Technologies
Business Unit Reporting, Revenue Reconciling Item [Line Items]
Revenue	192,449	174,508
Intersegment revenue	(1,230)	(1,834)
Earnings from operations	25,376	33,154
Industrial Technologies
Business Unit Reporting, Revenue Reconciling Item [Line Items]
Revenue	274,864	276,415
Intersegment revenue	(3,378)	(2,702)
Earnings from operations	76,906	64,265
Corporate and Other [Member]
Business Unit Reporting, Revenue Reconciling Item [Line Items]
Intersegment revenue	(4,608)	(4,536)
Total Segments [Member]
Business Unit Reporting, Revenue Reconciling Item [Line Items]
Revenue	467,313	450,923
Intersegment revenue	0	0
Earnings from operations	$ 102,282	$ 97,419