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Debt - Interest Expense (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Debt Disclosure [Abstract]        
Gross interest expense $ 22,136 $ 24,107 $ 66,081 $ 70,345
Capitalized interest (3,439) (2,831) (10,643) (7,817)
Amortization of deferred financing costs and loan discount 1,434 1,185 4,527 3,558
Interest Expense $ 20,131 $ 22,461 $ 59,965 $ 66,086