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 6 Months Ended
Jun. 30, 2011
Jun. 30, 2010
Jun. 30, 2011
Jun. 30, 2010
Interest Cost        
Interest costs charged to expense $ 76,196 $ 76,802 $ 154,414 $ 154,670
Interest costs capitalized 8,068 16,253 15,318 30,430
Total interest costs incurred 84,264 93,055 169,732 185,100
Interest Costs (Textuals) [Abstract]        
Non cash interest expense included in interest costs $ 9,661 $ 11,175 $ 19,234 $ 22,294