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Notes Payable (Tables)
6 Months Ended
Jun. 30, 2013
Notes Payable [Abstract]  
Notes Payable
   June 30, December 31, 
   2013 2012 
6.30% Senior Notes $299,021 $298,944 
$600.0 million Revolving Loan Facility  340,000  285,000 
 Total notes payable $639,021 $583,944