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Related Parties (Tables)
 6 Months Ended
Jun. 30, 2012
Related Parties [Abstract]  
Management fee according to fund's average daily net assets
         

Average Daily Net Assets

   Management Fee  

For the first $500 million

     1.250 % 

For the next $500 million

     1.225  

For the next $500 million

     1.200  

For the next $500 million

     1.175  

For net assets over $2 billion

     1.150