Goodwill and Other Intangible Assets - Carrying Value of Goodwill (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014
Goodwill [Roll Forward]
Balance at December 31, 2013	$ 66,271
Acquisition of EOGA	5,312
Balance at March 31, 2014	71,583
Energy Chemical Technologies [Member]
Goodwill [Roll Forward]
Balance at December 31, 2013	30,296
Acquisition of EOGA	5,312
Balance at March 31, 2014	35,608
Consumer and Industrial Chemical Technologies [Member]
Goodwill [Roll Forward]
Balance at December 31, 2013	20,642
Acquisition of EOGA	0
Balance at March 31, 2014	20,642
Teledrift [Member]
Goodwill [Roll Forward]
Balance at December 31, 2013	15,333
Acquisition of EOGA	0
Balance at March 31, 2014	$ 15,333