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Debt - Interest Expense (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Debt Disclosure [Abstract]      
Gross interest expense $ 92,017 $ 94,660 $ 82,887
Capitalized interest (14,815) (10,655) (11,307)
Interest Expense 83,167 90,037 $ 76,044
Interest costs incurred on notes payable, hedging activities and extinguishment costs $ 421 $ 1,100