Goodwill and Intangible Assets Goodwill (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2014
Goodwill [Roll Forward]
Beginning Balance, Goodwill	$ 398,905
Goodwill, Translation and Purchase Accounting Adjustments	(1,853)
Goodwill, Acquired During Period	9,293
Ending Balance, Goodwill	406,345
Energy & Chemicals [Member]
Goodwill [Roll Forward]
Beginning Balance, Goodwill	83,215
Goodwill, Translation and Purchase Accounting Adjustments	101
Goodwill, Acquired During Period	9,293
Ending Balance, Goodwill	92,609
Distribution & Storage [Member]
Goodwill [Roll Forward]
Beginning Balance, Goodwill	160,054
Goodwill, Translation and Purchase Accounting Adjustments	(1,954)
Goodwill, Acquired During Period	0
Ending Balance, Goodwill	158,100
BioMedical [Member]
Goodwill [Roll Forward]
Beginning Balance, Goodwill	155,636
Goodwill, Translation and Purchase Accounting Adjustments	0
Goodwill, Acquired During Period	0
Ending Balance, Goodwill	$ 155,636