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Notes Payable (Tables)
3 Months Ended
Mar. 31, 2013
Notes Payable [Abstract]  
Notes Payable
   March 31, December 31, 
   2013 2012 
6.30% Senior Notes $298,982 $298,944 
$600.0 million Revolving Loan Facility  320,000  285,000 
 Total notes payable $618,982 $583,944