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Debt - Interest Expense (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Debt Disclosure [Abstract]        
Gross interest cost $ 34,415 $ 34,630 $ 68,298 $ 68,994
Capitalized interest (6,887) (5,072) (12,765) (9,721)
Interest expense $ 27,528 $ 29,558 $ 55,533 $ 59,273