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Restructuring Activities (Tables)
 12 Months Ended
Dec. 31, 2014
Restructuring Activities [Abstract]  
Activity and liability balances related to restructuring charges
Activity and liability balances related to restructuring costs for the years ended December 31, 2013 and 2014 are as follows:

 
 
  
2013
  
  
2014
  
 
 
 
Liability at
  
  
Cash Payments
  
Liability at
  
  
Cash Payments
  
Liability at
 
 
 
December 31,
  
New
  
and Other
  
December 31,
  
New
  
and Other
  
December 31,
 
 
 
2012
  
Charges
  
Settlements
  
2013
  
Charges
  
Settlements
  
2014
 
Severance costs
 
$
122
  
$
1,239
  
$
(1,361
)
 
$
-
  
$
1,778
  
$
(1,778
)
 
$
-
 
Transportation of equipment
  
-
   
100
   
(100
)
  
-
   
-
   
-
   
-
 
Other restructuring costs
  
-
   
48
   
(48
)
  
-
   
54
   
(54
)
  
-
 
     Total
 
$
122
  
$
1,387
  
$
(1,509
)
 
$
-
  
$
1,832
  
$
(1,832
)
 
$
-