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Subsequent Events (Tables)
6 Months Ended
Jun. 30, 2012
Subsequent Events [Abstract]  
Principal amount of redemption prices
         
    Redemption
Price
 

Beginning on July 15, 2017

    103.500

Beginning on July 15, 2018

    102.333

Beginning on July 15, 2019

    101.167

Beginning on July 15, 2020 and thereafter

    100.000