Operating Segments and Related Information (Details 4) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019	Jun. 30, 2019	Dec. 31, 2018
Segment Reporting, Asset Reconciling Item [Line Items]
BU assets (accounts receivable, inventory and demo assets, Net)	$ 769,240	$ 737,805
BU assets (accounts receivable, inventory, demo assets and goodwill, Net)	2,110,229	2,102,401
Cash and cash equivalents	332,958	284,592	$ 268,885	$ 512,144
Prepaid expenses and other current assets	84,078	86,337
Property and equipment, net	255,770	255,905
Deferred Income Tax Assets, Net	41,393	39,983
Goodwill	1,340,989	1,364,596
Intangible assets, net	222,123	247,514
Other assets	110,746	120,809
Assets	3,157,297	3,137,541
Defense Technologies
Segment Reporting, Asset Reconciling Item [Line Items]
BU assets (accounts receivable, inventory and demo assets, Net)	366,786	332,639
Goodwill	707,568	728,697
Industrial Technologies
Segment Reporting, Asset Reconciling Item [Line Items]
BU assets (accounts receivable, inventory and demo assets, Net)	402,454	405,166
Goodwill	$ 633,421	$ 635,899