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Derivative Instruments (Narrative) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Derivative [Line Items]    
Derivative, Notional Amount $ 3,015,189 $ 4,525,856
Derivative Assets [1] 89,889 105,674
Monetized Interest Rate Floor [Member]    
Derivative [Line Items]    
Derivative, Notional Amount 1,500,000  
Derivative Assets 163,200  
Derivative Instruments, Gain (Loss) Reclassification from Accumulated OCI to Income, Estimated Net Amount to be Transferred $ 123,600  
Derivative Instruments, Gain (Loss) Reclassification from Accumulated OCI to Income, Estimate of Time to Transfer 6 years  
Interest Rate Swaps [Member]    
Derivative [Line Items]    
Derivative, Notional Amount $ 2,367,017 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 $ (69,200) $ (28,500)
[1] The fair value of each class of derivative is shown in Note 19.