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 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Interest Cost        
Interest costs charged to expense $ 67,521 $ 49,728 $ 121,613 $ 95,902
Interest costs capitalized 204 8,038 410 16,008
Total interest costs incurred 67,725 57,766 122,023 111,910
Interest Costs (Textual) [Abstract]        
Non cash interest expense included in interest costs $ 5,548 $ 5,490 $ 10,779 $ 10,932