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Debt (Maturities of debt financings) (Details)
$ in Thousands
Dec. 31, 2017
USD ($)
Debt Disclosure [Abstract]  
2018 $ 3,177,358
2019 4,191,915
2020 4,201,661
2021 3,671,914
2022 6,315,915
Thereafter 6,704,358
Total outstanding indebtedness, excluding fair value adjustments, debt issuance costs and debt discounts $ 28,263,121