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Notes Payable Maturities of Long Term Debt (Details) (USD $)
9 Months Ended 12 Months Ended 3 Months Ended
Sep. 30, 2012
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Sep. 30, 2012
Unsecured notes, net of discount, interest payable semi-annually at 5.25%, due March 2013
Dec. 31, 2012
Unsecured notes, net of discount, interest payable semi-annually at 5.25%, due March 2013
Dec. 31, 2011
Unsecured notes, net of discount, interest payable semi-annually at 5.25%, due March 2013
Debt Instrument              
Repayments of Long-term Debt   $ 558,400,000 $ 515,900,000 $ 510,100,000 $ 242,300,000    
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months   23,200,000          
Long-term Debt, Maturities, Repayments of Principal in Year Two   11,700,000          
Long-term Debt, Maturities, Repayments of Principal in Year Three   11,700,000          
Long-term Debt, Maturities, Repayments of Principal in Year Four   259,800,000          
Long-term Debt, Maturities, Repayments of Principal in Year Five   344,100,000          
Long-term Debt, Maturities, Repayments of Principal after Year Five   693,400,000          
Long-term Debt   1,343,900,000 915,800,000     0 236,400,000
Extinguishment of Debt, Amount         236,500,000    
Interest Paid   64,500,000 52,000,000 41,500,000 600,000    
Payments of Debt Extinguishment Costs $ (5,200,000) $ 5,200,000