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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		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Derivative [Line Items]
Total interest expense	$ (103,754)	$ (100,411)	$ (314,371)	$ (349,748)
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	(1,041)	(1,040)	(3,086)	(2,148)
Total interest expense	$ (1,041)	$ (1,040)	$ (3,086)	$ (3,008)

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Amount of interest expense recognized in earnings on cash flow hedge.

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Amount of the cost of borrowed funds accounted for as interest expense.

+ References

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Amount, after tax and reclassification, of gain (loss) from derivative instrument designated and qualifying as cash flow hedge included in assessment of hedge effectiveness, attributable to parent.

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