Goodwill - Carrying Value of Goodwill (Details) - USD ($)	3 Months Ended			6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Mar. 31, 2016	Jun. 30, 2017	Jun. 30, 2016
Goodwill [Roll Forward]
Balance, beginning of period				$ 56,660,000
Goodwill impairment recognized	$ 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