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Debt (Details 2) (USD $)
12 Months Ended
Dec. 31, 2011
Y
Dec. 31, 2010
Dec. 31, 2009
Schedule on basis of which debt matures      
2012 $ 66,063,000    
2013 163,003,000    
2014 820,780,000    
2015 806,104,000    
2016 278,642,000    
Thereafter 303,879,000    
Total 2,438,471,000    
Debt maturing in 2012 that may be extended for one year 16,800,000    
Extension option period for portion of debt maturing in 2012 (in years) 1    
Debt maturing in 2013 that may be extended for one year 17,900,000    
Extension option period for portion of debt maturing in 2013 (in years) 1    
Debt maturing in 2014 that may be extended for one year 662,000,000    
Extension option period for portion of debt maturing in 2014 (in years) 1    
Debt maturing in 2015 that may be extended for one year 405,600,000    
Extension option period for portion of debt maturing in 2015 (in years) 1    
Net discounts 12,200,000    
Capitalized interest costs $ 17,400,000 $ 16,500,000 $ 15,500,000