Goodwill - Carrying Value of Goodwill (Details) - USD ($)	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Goodwill [Roll Forward]
Balance, beginning of period	$ 72,820,000
Goodwill impairment recognized	0	$ 0
Balance, end of period	72,820,000
Energy Chemistry Technologies [Member]
Goodwill [Roll Forward]
Balance, beginning of period	36,318,000
Goodwill impairment recognized	0
Balance, end of period	36,318,000
Consumer and Industrial Chemistry Technologies [Member]
Goodwill [Roll Forward]
Balance, beginning of period	19,480,000
Goodwill impairment recognized	0
Balance, end of period	19,480,000
Teledrift [Member]
Goodwill [Roll Forward]
Balance, beginning of period	15,333,000
Goodwill impairment recognized	0
Balance, end of period	15,333,000
Production Technologies [Member]
Goodwill [Roll Forward]
Balance, beginning of period	1,689,000
Goodwill impairment recognized	0
Balance, end of period	$ 1,689,000