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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 | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Derivative [Line Items] |  |  |  |
Total interest expense | $ (108,065) | $ (102,666) | $ (210,617) | $ (249,337)
Cash Flow Hedging | Interest rate contract |  |  |  |
Derivative [Line Items] |  |  |  |
Net interest expense on cash flows hedges | 0 | 0 | 0 | (860)
Realized net losses reclassified from other comprehensive income | (1,028) | (1,029) | (2,046) | (1,108)
Total interest expense | $ (1,028) | $ (1,029) | $ (2,046) | $ (1,968)

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