Operating Segments and Related Information (Details 3) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Segment Reporting, Asset Reconciling Item [Line Items]
Consolidated segment operating income		$ 493,956	$ 473,981	$ 435,129
Unallocated corporate expense		(139,555)	(108,940)	(93,564)
Amortization of Intangible Assets		57,500	24,700	27,500
Asset Impairment Charges	$ (13,666)	(13,666)	(3,349)	0
Restructuring expenses		(10,099)	(4,854)	(625)
Loss on sale of Business		0	(13,708)	(23,588)
Operating Income (Loss)		273,260	318,606	289,961
Other Nonoperating Expense		(31,344)	(11,503)	(10,896)
Consolidated earnings before income taxes		241,916	307,103	279,065
Goodwill	1,364,596	1,364,596	904,571	909,811
Cash and Cash Equivalents	284,592	284,592	512,144
Prepaid expense and other current assets, excluding demo assets	86,337	86,337	69,445
Property, Plant and Equipment, Net	255,905	255,905	247,407
Deferred income taxes, net	39,983	39,983	100,620
Intangible assets, net	247,514	247,514	146,845
Other assets	120,809	120,809	89,152
Assets	3,137,541	3,137,541	2,781,242
Acquired Intangible Assets [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Amortization of Intangible Assets		(57,376)	(24,524)	(27,391)
Intangible assets, net	246,461	246,461	144,875
Total Segments [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Restructuring expenses		(10,099)
Operating Income (Loss)		493,956	473,981	435,129
BU assets (accounts receivable, inventories and demonstration assets, net)	737,805	737,805	711,058
Goodwill	1,364,596	1,364,596	904,571
BU assets (AR, inventories, demo assets and goodwill, net)	2,102,401	2,102,401	1,615,629
Industrial
Segment Reporting, Asset Reconciling Item [Line Items]
Operating Income (Loss)		240,847	216,880	199,903
BU assets (accounts receivable, inventories and demonstration assets, net)	279,352	279,352	266,457
Goodwill	404,476	404,476	391,603
Government and defense
Segment Reporting, Asset Reconciling Item [Line Items]
Operating Income (Loss)		207,430	199,702	179,160
BU assets (accounts receivable, inventories and demonstration assets, net)	332,639	332,639	307,041
Goodwill	728,697	728,697	284,188
Commercial
Segment Reporting, Asset Reconciling Item [Line Items]
Operating Income (Loss)		45,679	57,399	$ 56,066
BU assets (accounts receivable, inventories and demonstration assets, net)	125,814	125,814	137,560
Goodwill	$ 231,423	$ 231,423	$ 228,780