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Schedule of interest expense incurred (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Interest expense incurred        
Gross interest $ 78,863 $ 75,874 $ 233,866 $ 222,100
Capitalized interest (43,185) (32,556) (126,563) (88,029)
Interest expense $ 35,678 $ 43,318 $ 107,303 $ 134,071