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Goodwill (Tables)
 9 Months Ended
Sep. 30, 2016
Goodwill and Intangible Assets Disclosure [Abstract]  
Changes in the carrying value of goodwill
Changes in the carrying value of goodwill for each reporting unit are as follows (in thousands):
 
Energy Chemistry Technologies
 
Consumer and Industrial Chemistry Technologies
 
 Teledrift
 
Production Technologies
 
Total
Balance at December 31, 2015
$
36,318

 
$
19,480

 
$
15,333

 
$
1,689

 
$
72,820

Addition upon acquisition of IPI
862

 
—

 
—

 
—

 
862

Balance at September 30, 2016
$
37,180

 
$
19,480

 
$
15,333

 
$
1,689

 
$
73,682