Goodwill - Carrying Value of Goodwill (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2016 USD ($)
Goodwill [Roll Forward]
Balance, beginning of period	$ 72,820
Addition upon acquisition of IPI	862
Balance, end of period	73,682
Energy Chemistry Technologies
Goodwill [Roll Forward]
Balance, beginning of period	36,318
Addition upon acquisition of IPI	862
Balance, end of period	37,180
Consumer and Industrial Chemistry Technologies
Goodwill [Roll Forward]
Balance, beginning of period	19,480
Addition upon acquisition of IPI	0
Balance, end of period	19,480
Teledrift
Goodwill [Roll Forward]
Balance, beginning of period	15,333
Addition upon acquisition of IPI	0
Balance, end of period	15,333
Production Technologies
Goodwill [Roll Forward]
Balance, beginning of period	1,689
Addition upon acquisition of IPI	0
Balance, end of period	$ 1,689