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Debt - Interest Incurred and Capitalized (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Debt Disclosure [Abstract]      
Interest expense $ 595,551 $ 574,822 $ 170,083
Interest capitalized 5,554 0 0
Total interest incurred $ 601,105 $ 574,822 $ 170,083