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Corporate Indebtedness - Schedule of Consolidated Interest Expense, Excluding Capitalized Interest (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Interest expense        
Interest expense before capitalized interest $ 64,078 $ 72,859 $ 180,550 $ 217,273
Interest capitalized (8,504) (6,869) (22,785) (19,892)
Interest income (406) (356) (1,070) (1,269)
Interest expense, net $ 55,168 $ 65,634 $ 156,695 $ 196,112