Annual report pursuant to Section 13 and 15(d)

Debt (Details 2)

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Debt (Details 2) (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Schedule on basis of which debt matures      
2013 $ 121,129,000 [1]    
2014 158,341,000    
2015 795,802,000 [2]    
2016 278,642,000    
2017 551,388,000    
Thereafter 122,490,000    
Total 2,027,792,000 [3]    
Debt maturing in 2013 that may be extended for one year 17,500,000    
Extension option period for portion of debt maturing in 2013 (in years) 1 year    
Debt maturing in 2015 that may be extended for one year 411,100,000    
Extension option period for portion of debt maturing in 2015 (in years) 1 year    
Net discounts 8,600,000    
Capitalized interest costs $ 13,900,000 $ 17,400,000 $ 16,500,000
[1] Includes $17.5 million that may be extended for one year, subject to certain conditions.
[2] Includes $411.1 million that may be extended for one year, subject to certain conditions.
[3] Represents scheduled principal amortization and maturities only and therefore excludes net discounts of $8.6 million.