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Assets Manufactured for Internal Use (Tables)
 12 Months Ended
Dec. 31, 2013
Assets Manufactured for Internal Use  
Schedule of components of assets manufactured for internal use

 

 

 
   December 31,  
 
   2013   2012  
 
   (in thousands)
  

Internal use assets

   $ 23,409   $ 21,904  

Construction in progress

     5,263     1,823  
           
​ ​ ​ ​ ​ ​ ​ ​

Total cost

     28,672     23,727  

Accumulated depreciation

     (15,774 )   (13,948 )
           
​ ​ ​ ​ ​ ​ ​ ​

Assets manufactured for internal use

   $ 12,898   $ 9,779  
           
​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​