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Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2014
Accounting Policies [Abstract]  
Summary of Activity Relating to Allowance for Doubtful Accounts

The following is a summary of activity relating to the allowance for doubtful accounts for the years ended December 31, 2012, 2013 and 2014:

 

     In thousands  

Balance at December 31, 2011

    $ 1,160   

Charges to costs and expenses

      1,469   

Recoveries/write-offs

      (516 ) 
  

 

 

  

Balance at December 31, 2012

   2,113   

Charges to costs and expenses

   910   

Recoveries/write-offs

   (659 ) 
  

 

 

  

Balance at December 31, 2013

   2,364   

Charges to costs and expenses

   4,832   

Recoveries/write-offs

   (955 ) 
  

 

 

  

Balance at December 31, 2014

 $ 6,241