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Short-Term Borrowings (Tables)
9 Months Ended
Sep. 30, 2011
Short-Term Borrowings [Abstract] 
Schedule of Borrowings Outstanding and Letters of Credit
     September 30,
2011
     December 31,
2010
 

Balance outstanding at end of period

   $ 96,500       $ 110,000   

Letters of credit outstanding at end of period

   $ 14,883       $ 27,126