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Restructuring Charges (Tables)
 12 Months Ended
Dec. 31, 2013
Restructuring Charges.  
Schedule of changes in restructuring liability

 

 

 
   Severance  
 
   (In thousands)
  

Balance at December 31, 2010

   $ 171  

Cash payments

     —  
       
​ ​ ​ ​ ​

Balance at December 31, 2011

     171  

Severance and related costs

     4,169  

Cash payments

     (3,551 )

Non-cash items

     (130 )
       
​ ​ ​ ​ ​

Balance at December 31, 2012

     659  

Severance and related costs

     2,334  

Cash payments

     (2,950 )
       
​ ​ ​ ​ ​

Balance at December 31, 2013

   $ 43  
       
​ ​ ​ ​ ​
​ ​ ​ ​ ​