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, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Interest Cost        
Interest costs charged to expense $ 75,416 $ 54,629 $ 197,029 $ 150,531
Interest costs capitalized 70 7,915 480 23,923
Total interest costs incurred 75,486 62,544 197,509 174,454
Interest Costs (Textual) [Abstract]        
Non cash interest expense included in interest costs $ 5,736 $ 5,574 $ 16,515 $ 16,506