Goodwill (Details) - USD ($) $ in Thousands	6 Months Ended
Jun. 30, 2018	Jan. 01, 2018
Goodwill [Roll Forward]
Goodwill	$ 909,811	$ 909,811
Beginning Balance	909,811
Goodwill, Translation Adjustments	(5,962)
Ending Balance	903,849
Industrial
Goodwill [Roll Forward]
Goodwill	386,753	389,575
Ending Balance	386,753
Government and Defense
Goodwill [Roll Forward]
Goodwill	290,908	291,229
Ending Balance	290,908
Commercial
Goodwill [Roll Forward]
Goodwill	226,188	$ 229,007
Ending Balance	$ 226,188

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=77989000&loc=SL49117168-202975

Name:	us-gaap_Goodwill
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant