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Fair Value Measurements (Tables)
12 Months Ended
Dec. 31, 2013
Fair Value Disclosures [Abstract]  
Recurring Financial Assets Carried At Fair Value

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

 

    December 31, 2012 
    Level 1    Level 2    Level 3 
                
Investment in Global (1)  $23,607   $—     $—   

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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.