Quarterly report pursuant to Section 13 or 15(d)

Interest Costs (Details)

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Interest Costs (Details) (USD $)
In Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2011
Sep. 30, 2010
Sep. 30, 2011
Sep. 30, 2010
Interest Cost        
Interest costs charged to expense $ 75,316 $ 68,559 $ 229,730 $ 223,230
Interest costs capitalized 8,906 19,040 24,224 49,470
Total interest costs incurred 84,222 87,599 253,954 272,700
Interest Costs (Textual) [Abstract]        
Non cash interest expense included in interest costs $ 9,977 $ 10,689 $ 29,211 $ 32,983