Goodwill and Other Intangible Assets - Carrying Value of Goodwill (Details) (USD $) In Thousands, unless otherwise specified			6 Months Ended					6 Months Ended
	Jun. 30, 2014	Dec. 31, 2013	Jun. 30, 2014 Energy Chemical Technologies [Member]	Jun. 30, 2014 Consumer and Industrial Chemical Technologies [Member]	Dec. 31, 2013 Consumer and Industrial Chemical Technologies [Member]	Jun. 30, 2014 Teledrift [Member]	Dec. 31, 2013 Teledrift [Member]	Jun. 30, 2014 EOGA [Member]	Jun. 30, 2014 EOGA [Member] Energy Chemical Technologies [Member]	Jun. 30, 2014 EOGA [Member] Consumer and Industrial Chemical Technologies [Member]	Jun. 30, 2014 EOGA [Member] Teledrift [Member]	Jun. 30, 2014 SiteLark [Member]	Jun. 30, 2014 SiteLark [Member] Energy Chemical Technologies [Member]	Jun. 30, 2014 SiteLark [Member] Consumer and Industrial Chemical Technologies [Member]	Jun. 30, 2014 SiteLark [Member] Teledrift [Member]
Goodwill [Roll Forward]
Balance at December 31, 2013	$ 72,150	$ 66,271	$ 30,296	$ 20,642	$ 20,642	$ 15,333	$ 15,333
Acquisitions			5,900					5,312	5,312	0	0	567	567	0	0
Balance at June 30, 2014	$ 72,150	$ 66,271	$ 36,175	$ 20,642	$ 20,642	$ 15,333	$ 15,333