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Fair Value Measurements (Tables)
3 Months Ended
Mar. 31, 2014
Fair Value Disclosures [Abstract]  
Recurring Financial Assets Carried At Fair Value

   March 31, 2014
   Level 1   Level 2   Level 3 
                
Investment in Global (1)  $14,856   $—     $—   

 

   December 31, 2013
   Level 1   Level 2   Level 3 
                
Investment in Global (1)  $19,312   $—     $   

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(1) Global’s ordinary shares are publicly traded on the Alternative Investment Market (“AIM”), a market operated by the London Stock Exchange, with quoted prices in active markets. Accordingly, the fair value measurements of these securities have been classified as Level 1.