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, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Interest Cost        
Interest costs charged to expense $ 70,035 $ 75,316 $ 219,777 $ 229,730
Interest costs capitalized 8,005 8,906 24,087 24,224
Total interest costs incurred 78,040 84,222 243,864 253,954
Interest Costs (Textual) [Abstract]        
Non cash interest expense included in interest costs $ 9,755 $ 9,977 $ 30,786 $ 29,211