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Goodwill and Other Intangible Assets (Tables)
 6 Months Ended
Jun. 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
 
 TeledriftTM
 
Total
Balance at December 31, 2013
$
30,296

 
$
20,642

 
$
15,333

 
$
66,271

Addition upon acquisition of EOGA
5,312

 
—

 
—

 
5,312

Addition upon acquisition of SiteLark
567

 
—

 
—

 
567

Balance at June 30, 2014
$
36,175

 
$
20,642

 
$
15,333

 
$
72,150