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VALUATION AND QUALIFYING ACCOUNTS
 12 Months Ended
Dec. 31, 2014
Valuation and Qualifying Accounts  
VALUATION AND QUALIFYING ACCOUNTS
SCHEDULE II — VALUATION AND QUALIFYING ACCOUNTS
   
For the years ended
December 31, 2014, 2013 and 2012
  
(in thousands)
  
Balance at
Beginning
of Period
    
Charged to
Costs and
Expenses
    
Net (Deductions) 
Recoveries
  
Balance
at End of
Period
  
Year ended December 31, 2014
              
Allowance for doubtful accounts
  
$
13,497
    
$
2,280
    
$
(426
)
  (1)  
$
15,351
  
Deferred tax asset valuation allowance
  
$
83
    
$
—
    
$
(81
)
(2)
  
$
2
  
Year ended December 31, 2013
                                  
Allowance for doubtful accounts
  
$
9,110
    
$
8,815
    
$
(4,428
)
(1)
  
$
13,497
  
Deferred tax asset valuation allowance
  
$
1,003
    
$
—
    
$
(920
)
(2)
  
$
83
  
Year ended December 31, 2012
                                  
Allowance for doubtful accounts
  
$
8,093
    
$
1,784
    
$
(767
)
(1)
  
$
9,110
  
Deferred tax asset valuation allowance
  
$
1,295
    
$
—
    
$
(292
)
(2)
  
$
1,003
  
 
(1) Net (deductions) recoveries in the allowance for doubtful accounts principally reflect the write-off of previously reserved accounts net of recoveries.
(2) The valuation allowance for deferred tax assets is increased or decreased each year to reflect the state net operating losses that management believes will not be utilized before they expire.