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Notes Payable (Tables)
3 Months Ended
Mar. 31, 2014
Notes Payable [Abstract]  
Notes Payable
   March 31, December 31, 
   2014 2013 
         
6.30% Senior Notes $299,136 $299,098 
$600.0 million Revolving Loan Facility  425,000  355,000 
 Total notes payable $724,136 $654,098