Annual and transition report of foreign private issuers pursuant to Section 13 or 15(d)

Debt (Maturities of debt financings) (Details)

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Debt (Maturities of debt financings) (Details) - USD ($)
$ in Thousands
12 Months Ended
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