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Valuation and Qualifying Accounts (Tables)
 12 Months Ended
Dec. 31, 2013
Valuation and Qualifying Accounts [Abstract]  
Valuation and qualifying accounts
For the years ended December 31, 2013, 2012 and 2011:
 
 
Balance at
Beginning
of Year
  
Reserves
Assumed in
Acquisition
  
Additions
Charged to
Earnings
  
Charges to
Reserve, Net
(1)
  
Balance at
End
of Year
 
Year ended December 31, 2013
  
  
  
  
 
Allowance for doubtful accounts
 
$
1,166
  
$
496
  
$
1,037
  
$
(41
)
 
$
2,658
 
Reserves for inventory
  
6,999
   
1,131
   
72
   
(1,644
)
  
6,558
 
Valuation of deferred tax assets
  
806
   
(120
)
  
335
   
–
   
1,021
 
 
                    
Year ended December 31, 2012
                 
Allowance for doubtful accounts
 
$
789
  
$
383
  
$
204
  
$
(210
)
 
$
1,166
 
Reserves for inventory
  
4,717
   
1,694
   
1,785
   
(1,197
)
  
6,999
 
Valuation of deferred tax assets
  
–
   
827
   
(21
)
  
–
   
806
 
 
                    
Year ended December 31, 2011
                 
Allowance for doubtful accounts
 
$
723
  
$
171
  
$
(7
)
 
$
(98
)
 
$
789
 
Reserves for inventory
  
4,059
   
657
   
1,092
   
(1,091
)
  
4,717
 
Valuation of deferred tax assets
  
271,393
   
–
   
(271,393
)
  
–
   
–
 

(1) Deductions from the allowance for doubtful accounts equal accounts receivable written off, less recoveries, against the allowance. Deductions from the reserves for inventory excess and obsolete items equal inventory written off against the reserve as items were disposed of.