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Commitments and Contingencies (Tables)
6 Months Ended
Jun. 30, 2012
Commitments and Contingencies [Abstract]  
Schedule of share redemption price
         

Number of Years Held

  Redemption Price  

Less than one

    No redemption allowed  

One or more but less than two

    92.5% of redemption amount  

Two or more but less than three

    95.0% of redemption amount  

Three or more but less than four

    97.5% of redemption amount  

Four or more

    100.0% of redemption amount