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Debt - Interest Expense (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Debt Disclosure [Abstract]        
Gross interest $ 29,427 $ 35,840 $ 61,919 $ 67,453
Capitalized interest (1,035) (359) (1,638) (995)
Interest expense $ 28,392 $ 35,481 $ 60,281 $ 66,458