Goodwill (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Goodwill [Roll Forward]
Beginning Balance	$ 1,364,596	$ 904,571
Goodwill, Purchase Accounting Adjustments	(12,623)
Goodwill, Acquired During Period	22,857	469,446
Goodwill, Impairment Loss		(6,543)
Goodwill, Translation Adjustments	19,534	(2,878)
Ending Balance	1,394,364	1,364,596
Government and defense
Goodwill [Roll Forward]
Beginning Balance	728,697	284,188
Goodwill, Purchase Accounting Adjustments	(12,617)
Goodwill, Acquired During Period	22,857	445,501
Goodwill, Impairment Loss		0
Goodwill, Translation Adjustments	3,988	(992)
Ending Balance	742,925	728,697
Industrial
Goodwill [Roll Forward]
Beginning Balance	635,899	620,383
Goodwill, Purchase Accounting Adjustments	(6)
Goodwill, Acquired During Period	0	23,945
Goodwill, Impairment Loss		(6,543)
Goodwill, Translation Adjustments	15,546	(1,886)
Ending Balance	$ 651,439	$ 635,899