Quarterly report pursuant to Section 13 or 15(d)

Interest Costs (Details)

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Interest Costs (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Interest Cost        
Interest costs charged to expense $ 54,629 $ 70,035 $ 150,531 $ 219,777
Interest costs capitalized 7,915 8,005 23,923 24,087
Total interest costs incurred 62,544 78,040 174,454 243,864
Interest Costs (Textual) [Abstract]        
Non cash interest expense included in interest costs $ 5,574 $ 9,755 $ 16,506 $ 30,786