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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, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Derivative [Line Items] |  |  |  |
Total interest expense | $ (102,666) | $ (116,220) | $ (249,337) | $ (215,496)
Cash Flow Hedging | Interest rate contract |  |  |  |
Derivative [Line Items] |  |  |  |
Net interest expense on cash flows hedges | 0 | (640) | (860) | (1,277)
Realized net losses reclassified from other comprehensive income | (1,029) | 0 | (1,108) | 0
Total interest expense | $ (1,029) | $ (640) | $ (1,968) | $ (1,277)

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