Goodwill - Carrying Value of Goodwill (Details) - USD ($)	3 Months Ended				9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Sep. 30, 2017	Sep. 30, 2016
Goodwill [Roll Forward]
Balance, beginning of period					$ 56,660,000
Goodwill impairment recognized	$ 0	$ 0	$ 0	$ 0	0	$ 0
Balance, end of period	56,660,000				56,660,000
Energy Chemistry Technologies
Goodwill [Roll Forward]
Balance, beginning of period					37,180,000
Goodwill impairment recognized					0
Balance, end of period	37,180,000				37,180,000
Consumer and Industrial Chemistry Technologies
Goodwill [Roll Forward]
Balance, beginning of period					19,480,000
Goodwill impairment recognized					0
Balance, end of period	$ 19,480,000				$ 19,480,000