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
Mar. 31, 2012
Mar. 31, 2011
Interest Cost    
Interest costs charged to expense $ 76,971 $ 78,218
Interest costs capitalized 7,954 7,250
Total interest costs incurred 84,925 85,468
Interest Costs (Textual) [Abstract]    
Non cash interest expense included in interest costs $ 10,647 $ 9,573