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Debt - Interest Expense (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Debt Disclosure [Abstract]        
Gross interest $ 33,341 $ 29,427 $ 65,078 $ 61,919
Capitalized interest (1,363) (1,035) (3,799) (1,638)
Interest expense $ 31,978 $ 28,392 $ 61,279 $ 60,281