Annual report pursuant to Section 13 and 15(d)

Interest Costs (Details)

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Interest Costs (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Interest Cost      
Interest costs charged to expense $ 204,671 $ 265,321 $ 304,938
Interest costs capitalized 26,445 31,982 33,522
Total interest costs incurred 231,116 297,303 338,460
Interest Costs (Textual) [Abstract]      
Non cash interest expense included in interest costs $ 21,698 $ 35,924 $ 39,515