Derivative Financial Instruments - Interest Rate Risk (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Derivative [Line Items]
Unrealized gain on terminated cash flow hedge remaining in AOCI, before tax	$ 226,900
Unrealized gain on terminated cash flow hedge remaining in AOCI, net of tax	$ 163,900
Term unrealized gains reclassified into earnings	5 years
Proceeds from termination of interest rate swaps	$ 180,500	$ 0
Receivable from unsettled cash flow hedge	47,000
Derivatives designated as hedging instruments | Interest rate swaps
Derivative [Line Items]
Derivative notional amount	5,000,000
Derivatives net asset fair value	$ 227,500