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Debt (Narrative) (Details) (USD $)
 12 Months Ended 12 Months Ended 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Dec. 31, 2011
Unsecured Letter Of Credit Facility [Member]
Dec. 31, 2010
Unsecured Letter Of Credit Facility [Member]
Dec. 31, 2011
Letter Of Credit [Member]
Dec. 31, 2011
Unsecured revolving credit facility [Member]
Mar. 30, 2011
Unsecured revolving credit facility [Member]
Dec. 31, 2010
Unsecured revolving credit facility [Member]
Dec. 31, 2009
Unsecured revolving credit facility [Member]
Dec. 31, 2011
Financial Services [Member]
Dec. 31, 2010
Financial Services [Member]
Dec. 31, 2009
Financial Services [Member]
Dec. 31, 2011
Financial Services [Member]
Repurchase Agreements [Member]
Debt Instrument                            
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months $ 96,400,000                          
Long-term Debt, Maturities, Repayments of Principal in Year Two 182,200,000                          
Long-term Debt, Maturities, Repayments of Principal in Year Three 574,600,000                          
Long-term Debt, Maturities, Repayments of Principal in Year Four 492,500,000                          
Long-term Debt, Maturities, Repayments of Principal in Year Five 480,000,000                          
Long-term Debt, Maturities, Repayments of Principal after Year Five 1,300,000,000                          
Loss on debt retirements 5,638,000 38,920,000 31,594,000                      
Maximum borrowing capacity       200,000,000   191,200,000   250,000,000     2,500,000 2,500,000 175,000,000 2,500,000
Credit Facility termination date               Mar. 30, 2011            
Cash collateral for borrowed securities               250,000,000            
Credit facility expiration date       June 2014     June 2012             October 2012
Write-off of unamortized issuance costs             1,300,000              
Unused credit lines at year-end                     2,500,000 2,500,000 157,000,000  
Letters of Credit Outstanding, Amount 235,900,000 388,900,000   152,700,000 167,200,000 83,200,000     221,600,000          
Line of Credit Facility, Amount Outstanding             $ 0   $ 0 $ 0       $ 0