Derivative Instruments (Narrative) (Details) - USD ($) $ in Thousands |
6 Months Ended | |||
|---|---|---|---|---|
Jun. 30, 2021 |
Dec. 31, 2020 |
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| Derivative [Line Items] | ||||
| Derivative, Notional Amount | $ 2,977,293 | $ 3,015,189 | ||
| Derivative Asset | [1] | 61,358 | 89,889 | |
| Monetized Interest Rate Floor [Member] | ||||
| Derivative [Line Items] | ||||
| Derivative, Notional Amount | 1,500,000 | |||
| Derivative Asset | 163,200 | |||
| Derivative Instruments, Gain (Loss) Reclassification from Accumulated OCI to Income, Estimated Net Amount to be Transferred | $ 111,700 | |||
| Derivative Instruments, Gain (Loss) Reclassification from Accumulated OCI to Income, Estimate of Time to Transfer | 5 years 6 months | |||
| Interest rate swaps | ||||
| Derivative [Line Items] | ||||
| Derivative, Notional Amount | $ 2,270,249 | 2,367,017 | ||
| Derivative Asset | 59,170 | 86,389 | ||
| Variation Margin Impact to Positive Fair Values of Cleared Swaps | (207) | 0 | ||
| Variation Margin Impact to Negative Fair Values of Cleared Swaps | $ (46,600) | $ (69,200) | ||
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