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Short Term Investments - Available for Sale (Tables)
12 Months Ended
Dec. 31, 2013
Cost and Fair Value of Investments
   
December 31,
   
December 31,
 
   
2013
   
2012
 
   
(in thousands)
 
             
At start of  year
  $ 76,183     $ 54,940  
Additions
    172,168       102,575  
Disposals
    (109,795 )     (82,193 )
Unrealized capital gain/(loss) - investments
    (239 )     861  
                 
At end of year
  $ 138,317     $ 76,183