Goodwill - Additional Disclosures (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2013 segment
Goodwill [Line Items]
Goodwill acquired	$ 39,328
Number of Operating Segments with Goodwill Balance	2
Energy Chemical Technologies [Member]
Goodwill [Line Items]
Goodwill acquired	18,686
Consumer and Industrial Chemical Technologies [Member]
Goodwill [Line Items]
Goodwill acquired	$ 20,642