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Goodwill (Tables)
 12 Months Ended
Dec. 31, 2012
Goodwill [Abstract]  
Schedule of changes in the carrying value of goodwill
Changes in the carrying value of goodwill for each reporting unit are as follows (in thousands):
 
 
Chemicals and Logistics
 
Downhole Tools
 
Teledrift
 
Artificial Lift
 
Total
Balance at December 31, 2010:
 
 
 
 
 
 
 
 
 
Goodwill
$
11,610

 
$
43,009

 
$
46,396

 
$
5,861

 
$
106,876

Accumulated impairment losses
—

 
(43,009
)
 
(31,063
)
 
(5,861
)
 
(79,933
)
Goodwill balance, net
11,610

 
—

 
15,333

 
—

 
26,943

Activity during the year 2011:
 
 
 
 
 
 
 
 
 
Goodwill impairment recognized
—

 
—

 
—

 
—

 
—

Balance at December 31, 2011:
 
 
 
 
 
 
 
 
 
Goodwill
11,610

 
43,009

 
46,396

 
5,861

 
106,876

Accumulated impairment losses
—

 
(43,009
)
 
(31,063
)
 
(5,861
)
 
(79,933
)
Goodwill balance, net
11,610

 
—

 
15,333

 
—

 
26,943

Activity during the year 2012:
 
 
 
 
 
 
 
 
 
Goodwill impairment recognized
—

 
—

 
—

 
—

 
—

Balance at December 31, 2012:
 
 
 
 
 
 
 
 
 
Goodwill
11,610

 
43,009

 
46,396

 
5,861

 
106,876

Accumulated impairment losses
—

 
(43,009
)
 
(31,063
)
 
(5,861
)
 
(79,933
)
Goodwill balance, net
$
11,610

 
$
—

 
$
15,333

 
$
—

 
$
26,943