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Valuation and Qualifying Accounts (Tables)
 12 Months Ended
Dec. 31, 2014
Valuation and Qualifying Accounts [Abstract]  
Summary of changes in valuation and qualifying accounts
The following table summarizes the changes in our valuation and qualifying accounts:

 
 
Year Ended December 31,
 
(In thousands)
 
2014
  
2013
  
2012
 
Balance—beginning of period
 
$
259
  
$
549
  
$
676
 
Charges(credits) to cost and expense
  
92
   
139
   
267
 
Recoveries
  
—
   
89
   
(277
)
Write offs
  
(24
)
  
(366
)
  
(117
)
Balance—end of period
 
$
327
  
$
259
  
$
549