Goodwill and Intangible Assets Goodwill (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2013
Goodwill [Roll Forward]
Beginning Balance, Goodwill	$ 398,941
Goodwill, Translation and Purchase Accounting Adjustments	(320)
Goodwill, Acquired During Period	1,159
Ending Balance, Goodwill	399,780
Energy & Chemicals [Member]
Goodwill [Roll Forward]
Beginning Balance, Goodwill	83,215
Goodwill, Translation and Purchase Accounting Adjustments	0
Goodwill, Acquired During Period	0
Ending Balance, Goodwill	83,215
Distribution & Storage [Member]
Goodwill [Roll Forward]
Beginning Balance, Goodwill	158,789
Goodwill, Translation and Purchase Accounting Adjustments	(320)
Goodwill, Acquired During Period	1,159
Ending Balance, Goodwill	159,628
BioMedical [Member]
Goodwill [Roll Forward]
Beginning Balance, Goodwill	156,937
Goodwill, Translation and Purchase Accounting Adjustments	0
Goodwill, Acquired During Period	0
Ending Balance, Goodwill	$ 156,937