Operating Segments and Related Information (Details 2) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Business Unit Reporting, Revenue Reconciling Item [Line Items]
Revenue	$ 482,015	$ 481,998	$ 932,938	$ 926,734
Earnings from operations	99,810	63,737	128,305	144,819
Defense Technologies
Business Unit Reporting, Revenue Reconciling Item [Line Items]
Revenue	181,817	197,509	356,325	370,859
Intersegment revenue	(1,438)	(1,436)	(3,273)	(2,947)
Earnings from operations	41,155	45,786	74,309	92,676
Industrial Technologies
Business Unit Reporting, Revenue Reconciling Item [Line Items]
Revenue	300,198	284,489	576,613	555,875
Intersegment revenue	(3,927)	(3,876)	(6,629)	(8,462)
Earnings from operations	107,137	71,633	171,402	140,652
Eliminations
Business Unit Reporting, Revenue Reconciling Item [Line Items]
Intersegment revenue	(5,365)	(5,312)	(9,902)	(11,409)
Total Segments [Member]
Business Unit Reporting, Revenue Reconciling Item [Line Items]
Revenue	482,015	481,998	932,938	926,734
Intersegment revenue	0	0	0	0
Earnings from operations	$ 148,292	$ 117,419	$ 245,711	$ 233,328