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Debt - Interest Expense (Details 2) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Debt Disclosure [Abstract]      
Gross interest cost $ 98,103 $ 33,077 $ 10,016
Capitalized interest (8,690) (13,196) (9,646)
Interest expense $ 89,413 $ 19,881 $ 370