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Notes Payable (Tables)
9 Months Ended
Sep. 30, 2013
Notes Payable [Abstract]  
Notes Payable
   September 30, December 31, 
   2013 2012 
6.30% Senior Notes $299,059 $298,944 
$600.0 million Revolving Loan Facility  355,000  285,000 
 Total notes payable $654,059 $583,944