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Debt - Interest Expense (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Debt Disclosure [Abstract]        
Gross interest cost $ 34,630 $ 35,221 $ 68,994 $ 69,833
Capitalized interest (5,072) (2,650) (9,721) (5,347)
Interest expense $ 29,558 $ 32,571 $ 59,273 $ 64,486