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Interest Expense (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Interest Expense      
Interest on borrowings $ 456,678 $ 362,843 $ 303,966
Less capitalized interest (59,358) (52,817) (46,049)
Interest 397,320 310,026 257,917
Amortization of debt discounts and issuance costs 36,691 32,706 29,454
Interest expense $ 434,011 $ 342,732 $ 287,371