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Operating Leases (Tables)
 12 Months Ended
Dec. 31, 2014
Minimum Rental Commitment Under Operating Leases
The minimum rental commitment due under the operating leases is as follows (in thousands):

Years Ending December 31,
  
Combined
  
       
2015
   $ 2,242  
2016
     2,310  
2017
     2,372  
2018
     2,041  
2019 and beyond
     11,246  
Total minimum rental commitment
   $ 20,211