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Goodwill and Other Intangible Assets (Tables)
 9 Months Ended
Sep. 30, 2014
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 Chemical Technologies
 
Consumer and Industrial Chemical Technologies
 
 Teledrift®
 
Total
Balance at December 31, 2013
$
30,296

 
$
20,642

 
$
15,333

 
$
66,271

Final Florida Chemical acquisition
     adjustment
—

 
(1,162
)
 
—

 
(1,162
)
Addition upon acquisition of EOGA
5,455

 
—

 
—

 
5,455

Addition upon acquisition of SiteLark
567

 
—

 
—

 
567

Balance at September 30, 2014
$
36,318

 
$
19,480

 
$
15,333

 
$
71,131