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Notes Payable (Tables)
12 Months Ended
Dec. 31, 2011
Notes Payable [Abstract]  
Notes Payable
   2011 2010 
6.30% Senior Notes $298,790 $298,637 
$600.0 million Revolving Loan Facility  180,000  0 
 Total notes payable $478,790 $298,637