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Derivative Financial Instruments - Impact on Interest Expense of Interest Rate Agreements Accounted for as Cash Flow Hedges (Details) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Derivative [Line Items] |  |  |  |  |  |
Total interest expense |  |  |  | $ (448,005) | $ (479,808) | $ (239,039)
Cash Flow Hedging | Interest Rate Contract |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Net interest expense on cash flows hedges | $ (860) | $ (2,847) | $ (3,228) |  |  |
Realized net losses reclassified from other comprehensive income | (3,188) | 0 | 0 |  |  |
Total interest expense | $ (4,048) | $ (2,847) | $ (3,228) |  |  |

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