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Debt - Interest Expense (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Debt Disclosure [Abstract]      
Gross interest cost $ 138,211 $ 129,571 $ 118,276
Capitalized interest (11,097) (6,671) (5,656)
Interest expense $ 127,114 $ 122,900 $ 112,620