Goodwill and Other Intangible Assets - Carrying Value of Goodwill (Details)
$ in Thousands
 9 Months Ended
Sep. 30, 2015
USD ($)
Goodwill [Roll Forward]  
Balance at December 31, 2014 $ 71,131
Addition upon acquisition of IAL 1,689
Balance at September 30, 2015 72,820
Energy Chemistry Technologies [Member]  
Goodwill [Roll Forward]  
Balance at December 31, 2014 36,318
Addition upon acquisition of IAL 0
Balance at September 30, 2015 36,318
Consumer and Industrial Chemistry Technologies [Member]  
Goodwill [Roll Forward]  
Balance at December 31, 2014 19,480
Addition upon acquisition of IAL 0
Balance at September 30, 2015 19,480
Teledrift [Member]  
Goodwill [Roll Forward]  
Balance at December 31, 2014 15,333
Addition upon acquisition of IAL 0
Balance at September 30, 2015 15,333
Production Technologies [Member]  
Goodwill [Roll Forward]  
Balance at December 31, 2014 0
Addition upon acquisition of IAL 1,689
Balance at September 30, 2015 $ 1,689