Segment and Geographic Information Goodwill by Segment (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Goodwill [Line Items]
Goodwill	$ 218,390	$ 405,522	$ 398,905
Foreign currency translation adjustments and other	(1,887)	(2,676)
Goodwill acquired during the year	10,601	9,293
Goodwill, Impairment Loss	(195,846)	0
Goodwill, Impaired, Accumulated Impairment Loss	195,846	0
Energy & Chemicals [Member]
Goodwill [Line Items]
Goodwill	27,873	92,638	83,215
Foreign currency translation adjustments and other	(162)	130
Goodwill acquired during the year	0	9,293
Goodwill, Impairment Loss	(64,603)
Goodwill, Impaired, Accumulated Impairment Loss	64,603
Distribution & Storage [Member]
Goodwill [Line Items]
Goodwill	165,940	157,248	160,054
Foreign currency translation adjustments and other	(1,909)	(2,806)
Goodwill acquired during the year	10,601	0
Goodwill, Impairment Loss	0
Goodwill, Impaired, Accumulated Impairment Loss	0
BioMedical [Member]
Goodwill [Line Items]
Goodwill	24,577	155,636	$ 155,636
Foreign currency translation adjustments and other	184	0
Goodwill acquired during the year	0	$ 0
Goodwill, Impairment Loss	(131,243)
Goodwill, Impaired, Accumulated Impairment Loss	$ 131,243