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Other Non-Current Liabilities (Tables)
12 Months Ended
Dec. 31, 2013
Other Noncurrent Liabilities
   
December 31,
   
December 31,
 
   
2013
   
2012
 
   
(in thousands)
 
             
Personnel related liabilities
  $ 4,278     $ 6,920  
Defined benefit pension obligations, net (note 9)
    3,536       4,720  
Other non-current liabilities
    3,384       2,672  
                 
    $ 11,198     $ 14,312