Goodwill - Carrying Value of Goodwill (Details) - USD ($)	3 Months Ended			6 Months Ended
	Jun. 30, 2016	Mar. 31, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Goodwill [Roll Forward]
Balance, beginning of period		$ 72,820,000		$ 72,820,000
Goodwill impairment recognized	$ 0	0	$ 0	0	$ 0
Balance, end of period	72,820,000			72,820,000
Energy Chemistry Technologies [Member]
Goodwill [Roll Forward]
Balance, beginning of period		36,318,000		36,318,000
Goodwill impairment recognized				0
Balance, end of period	36,318,000			36,318,000
Consumer and Industrial Chemistry Technologies [Member]
Goodwill [Roll Forward]
Balance, beginning of period		19,480,000		19,480,000
Goodwill impairment recognized				0
Balance, end of period	19,480,000			19,480,000
Teledrift [Member]
Goodwill [Roll Forward]
Balance, beginning of period		15,333,000		15,333,000
Goodwill impairment recognized				0
Balance, end of period	15,333,000			15,333,000
Production Technologies [Member]
Goodwill [Roll Forward]
Balance, beginning of period		$ 1,689,000		1,689,000
Goodwill impairment recognized				0
Balance, end of period	$ 1,689,000			$ 1,689,000