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Notes Payable, net - Interest Expense (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Debt Disclosure [Abstract]      
Gross interest expense $ 94,660 $ 82,887 $ 52,437
Capitalized interest (10,655) (11,307) (6,516)
Amortization of deferred financing costs and loan discount/premium, net 6,032 4,464 4,746
Interest Expense 90,037 $ 76,044 $ 50,667
Interest costs incurred on notes payable, hedging activities and extinguishment costs $ 1,100