Goodwill and Intangible Assets Goodwill (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2016	Dec. 31, 2015
Goodwill [Line Items]
Goodwill, Impairment Loss		$ 195,846
Goodwill [Roll Forward]
Beginning Balance, Goodwill	$ 218,390
Goodwill, Translation and Purchase Accounting Adjustments	600
Ending Balance, Goodwill	218,990	218,390
Goodwill, Impaired, Accumulated Impairment Loss	195,846
Energy & Chemicals [Member]
Goodwill [Roll Forward]
Beginning Balance, Goodwill	27,873
Goodwill, Translation and Purchase Accounting Adjustments	0
Ending Balance, Goodwill	27,873	27,873
Goodwill, Impaired, Accumulated Impairment Loss	64,603
Distribution & Storage [Member]
Goodwill [Roll Forward]
Beginning Balance, Goodwill	165,940
Goodwill, Translation and Purchase Accounting Adjustments	600
Ending Balance, Goodwill	166,540	165,940
Goodwill, Impaired, Accumulated Impairment Loss	0
BioMedical [Member]
Goodwill [Roll Forward]
Beginning Balance, Goodwill	24,577
Goodwill, Translation and Purchase Accounting Adjustments	0
Ending Balance, Goodwill	24,577	$ 24,577
Goodwill, Impaired, Accumulated Impairment Loss	$ 131,243