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Notes Payable (Tables)
9 Months Ended
Sep. 30, 2012
Notes Payable [Abstract]  
Notes Payable
   September 30, December 31, 
   2012 2011 
6.30% Senior Notes $298,906 $298,790 
$600.0 million Revolving Loan Facility  250,000  180,000 
 Total notes payable $548,906 $478,790