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Debt (Maturities of debt financings) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Maturities of Long-term Debt [Abstract] |  |  |
2020 | $ 3,454,301 |  |
2021 | 4,450,347 |  |
2022 | 6,859,785 |  |
2023 | 3,532,951 |  |
2024 | 3,010,218 |  |
Thereafter | 8,220,628 |  |
Total outstanding indebtedness, excluding fair value adjustments, debt issuance costs and debt discounts | 29,528,230 |  |
Amortization of debt issuance costs, debt discount, debt premium and lease premium | $ 69,500 | $ 64,200 | $ 65,400

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