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, 2014
Mar. 31, 2013
Interest Cost    
Interest costs charged to expense $ 54,092 $ 46,174
Interest costs capitalized 206 7,970
Total interest costs incurred 54,298 54,144
Interest Costs (Textual) [Abstract]    
Non cash interest expense included in interest costs $ 5,231 $ 5,442