Goodwill and Other Intangible Assets - Carrying Value of Goodwill (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Dec. 31, 2014
Goodwill [Roll Forward]
Balance at December 31, 2014		$ 71,131
Balance at March 31, 2015	72,820	71,131
IAL [Member]
Goodwill [Roll Forward]
Addition upon acquisition of IAL	1,689
Energy Chemistry Technologies [Member]
Goodwill [Roll Forward]
Balance at December 31, 2014		36,318
Balance at March 31, 2015	36,318	36,318
Energy Chemistry Technologies [Member] | IAL [Member]
Goodwill [Roll Forward]
Addition upon acquisition of IAL	0
Consumer and Industrial Chemistry Technologies [Member]
Goodwill [Roll Forward]
Balance at December 31, 2014		19,480
Balance at March 31, 2015	19,480	19,480
Consumer and Industrial Chemistry Technologies [Member] | IAL [Member]
Goodwill [Roll Forward]
Addition upon acquisition of IAL	0
Teledrift [Member]
Goodwill [Roll Forward]
Balance at December 31, 2014		15,333
Balance at March 31, 2015	15,333	15,333
Teledrift [Member] | IAL [Member]
Goodwill [Roll Forward]
Addition upon acquisition of IAL	0
Production Technologies [Member]
Goodwill [Roll Forward]
Balance at December 31, 2014		0
Balance at March 31, 2015	1,689	0
Production Technologies [Member] | IAL [Member]
Goodwill [Roll Forward]
Addition upon acquisition of IAL	$ 1,689