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Goodwill and Intangible Assets Goodwill (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2017	Dec. 31, 2016
Goodwill [Roll Forward]
Beginning Balance, Goodwill	$ 217,970
Goodwill, Translation and Purchase Accounting Adjustments	2,110
Goodwill, Acquired During Period	237,401
Ending Balance, Goodwill	457,481
Goodwill, Impaired, Accumulated Impairment Loss	195,846	$ 195,846
Energy & Chemicals [Member]
Goodwill [Roll Forward]
Beginning Balance, Goodwill	27,873
Goodwill, Translation and Purchase Accounting Adjustments	0
Goodwill, Acquired During Period	236,246
Ending Balance, Goodwill	264,119
Goodwill, Impaired, Accumulated Impairment Loss	64,603	64,603
Distribution & Storage [Member]
Goodwill [Roll Forward]
Beginning Balance, Goodwill	165,520
Goodwill, Translation and Purchase Accounting Adjustments	2,214
Goodwill, Acquired During Period	1,155
Ending Balance, Goodwill	168,889
Goodwill, Impaired, Accumulated Impairment Loss	0	0
BioMedical [Member]
Goodwill [Roll Forward]
Beginning Balance, Goodwill	24,577
Goodwill, Translation and Purchase Accounting Adjustments	104
Goodwill, Acquired During Period	0
Ending Balance, Goodwill	24,473
Goodwill, Impaired, Accumulated Impairment Loss	$ 131,243	$ 131,243

X

- Definition

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.

+ References

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=64834752&loc=SL49117168-202975

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X

- Definition

Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination.

+ References

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

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X

- Definition

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

+ References

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,h)
-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267

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- Definition

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- Definition

Amount of increase (decrease) from foreign currency translation adjustments and purchase accounting adjustments of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (g)
-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 805
-SubTopic 10
-Section 25
-Paragraph 16
-URI http://asc.fasb.org/extlink&oid=73531572&loc=d3e961-128460

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-Topic 350
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-Section 50
-Paragraph 1
-Subparagraph (f)
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