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Derivative Instruments Derivative Instruments (Narrative) (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2020
Oct. 01, 2020
Dec. 31, 2019
Derivative [Line Items]      
Derivative, Notional Amount $ 3,548,498   $ 4,525,856
Derivative Assets [1] 147,850   105,674
Interest Rate Floor [Member]      
Derivative [Line Items]      
Derivative, Notional Amount $ 500,000   1,500,000
Derivative, Floor Interest Rate 2.00%    
Derivative, Effective Date Dec. 15, 2020    
Derivative, Maturity Date Dec. 15, 2026    
Premium paid for interest rate floor cash flow hedge $ 10,700    
Maximum Length of Time Hedged in Interest Rate Cash Flow Hedge 6 years 2 months 12 days    
Unrealized gain (loss) on interest rate cash flow hedges, net of tax, amount recorded in accumulated other comprehensive income $ 38,700    
Interest Rate Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months, Net (1,400)    
Interest Rate Floor [Member] | Subsequent Event [Member]      
Derivative [Line Items]      
Cash Flow Hedge Gain Loss Reclassified Into OCI before Tax   $ 37,600  
Interest Rate Swaps [Member]      
Derivative [Line Items]      
Derivative, Notional Amount 2,425,837   2,606,181
Variation Margin Impact to Positive Fair Values of Cleared Swaps 0   (617)
Variation Margin Impact to Negative Fair Values of Cleared Swaps (77,800)   $ (28,500)
Monetized Interest Rate Floor [Member]      
Derivative [Line Items]      
Derivative, Notional Amount 1,000,000    
Derivative Assets 115,900    
Derivative Instruments, Gain (Loss) Reclassification from Accumulated OCI to Income, Estimated Net Amount to be Transferred $ 90,400    
Derivative Instruments, Gain (Loss) Reclassification from Accumulated OCI to Income, Estimate of Time to Transfer 5 years 8 months 12 days    
[1] * The fair value of each class of derivative is shown in Note 11.