Goodwill and Other Intangible Assets - Carrying Value of Goodwill (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2015 USD ($)
Goodwill [Roll Forward]
Balance at December 31, 2014	$ 71,131
Addition upon acquisition of IAL	1,689
Balance at September 30, 2015	72,820
Energy Chemistry Technologies [Member]
Goodwill [Roll Forward]
Balance at December 31, 2014	36,318
Addition upon acquisition of IAL	0
Balance at September 30, 2015	36,318
Consumer and Industrial Chemistry Technologies [Member]
Goodwill [Roll Forward]
Balance at December 31, 2014	19,480
Addition upon acquisition of IAL	0
Balance at September 30, 2015	19,480
Teledrift [Member]
Goodwill [Roll Forward]
Balance at December 31, 2014	15,333
Addition upon acquisition of IAL	0
Balance at September 30, 2015	15,333
Production Technologies [Member]
Goodwill [Roll Forward]
Balance at December 31, 2014	0
Addition upon acquisition of IAL	1,689
Balance at September 30, 2015	$ 1,689