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Goodwill
 9 Months Ended
Sep. 30, 2016
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill
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


Goodwill within the Teledrift and Production Technologies reporting units was tested for impairment during the three months ended March 31, 2016, June 30, 2016, and September 30, 2016. No impairments of goodwill were recognized during the three and nine months ended September 30, 2016 and 2015 (see Note 3).