Operating Segments and Related Information (Details 2) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Business Unit Reporting, Revenue Reconciling Item [Line Items]
Revenue	$ 450,923	$ 444,736
Intersegment revenue	0	0
Earnings from operations	28,495	81,082
Defense Technologies
Business Unit Reporting, Revenue Reconciling Item [Line Items]
Revenue	174,508	173,350
Intersegment revenue	(1,834)	(1,512)
Earnings from operations	33,154	46,890
Industrial Technologies
Business Unit Reporting, Revenue Reconciling Item [Line Items]
Revenue	276,415	271,386
Intersegment revenue	(2,702)	(4,586)
Earnings from operations	64,265	69,019
Eliminations
Business Unit Reporting, Revenue Reconciling Item [Line Items]
Intersegment revenue	(4,536)	(6,098)
Total Segments [Member]
Business Unit Reporting, Revenue Reconciling Item [Line Items]
Revenue	450,923	444,736
Earnings from operations	$ 97,419	$ 115,909