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Derivative Instruments - Non-hedge Derivatives (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Derivative [Line Items]          
Notional Amount $ 1,500,000   $ 1,500,000    
Not Designated as Hedging Instrument          
Derivative [Line Items]          
Notional Amount 3,155,470   3,155,470   $ 3,131,832
Estimated Fair Value (816)   (816)   (1,317)
Derivative, Gain (Loss) on Derivative, Net 51 $ (794) 501 $ (1,137)  
Not Designated as Hedging Instrument | Assets          
Derivative [Line Items]          
Notional Amount 1,577,735   1,577,735   1,565,916
Estimated Fair Value 66,074   66,074   101,602
Not Designated as Hedging Instrument | Liabilities          
Derivative [Line Items]          
Notional Amount 1,577,735   1,577,735   1,565,916
Estimated Fair Value $ (66,890)   $ (66,890)   $ (102,919)