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Goodwill (Tables)
 6 Months Ended
Jun. 30, 2013
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):
 
 
Chemical Technologies
 
Non-energy Chemical Technologies
 
Teledrift
 
Total
Balance at December 31, 2012
 
$
11,610

 
$
—

 
$
15,333

 
$
26,943

Add:
 
 
 
 
 
 
 
 
Acquisition of Florida Chemical
 
18,686

 
20,642

 
—

 
39,328

Balance at June 30, 2013
 
$
30,296

 
$
20,642

 
$
15,333

 
$
66,271