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Notes Payable (Tables)
12 Months Ended
Dec. 31, 2012
Notes Payable [Abstract]  
Notes Payable
   2012 2011 
6.30% Senior Notes $298,944 $298,790 
$600.0 million Revolving Loan Facility  285,000  180,000 
 Total notes payable $583,944 $478,790