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Financing Agreements (Borrowings Under Repurchase Agreement) (Details) - Repurchase Agreement Borrowings - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Debt Securities, Available-for-sale [Line Items]
Amortized Cost Basis	$ 2,219,492	$ 2,494,976
Weighted Average Interest Rate	3.02%	3.16%
Within 30 days
Debt Securities, Available-for-sale [Line Items]
Amortized Cost Basis	$ 2,083,420	$ 2,494,976
Weighted Average Interest Rate	3.08%	3.16%
Over 30 days to 3 months
Debt Securities, Available-for-sale [Line Items]
Amortized Cost Basis	$ 136,072	$ 0
Weighted Average Interest Rate	2.14%	0.00%
Over 3 months to 12 months
Debt Securities, Available-for-sale [Line Items]
Amortized Cost Basis	$ 0	$ 0
Weighted Average Interest Rate	0.00%	0.00%
Over 12 months
Debt Securities, Available-for-sale [Line Items]
Amortized Cost Basis	$ 0	$ 0
Weighted Average Interest Rate	0.00%	0.00%

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- Definition

Financing Agreements, Liabilities

+ References

No definition available.

+ Details

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- Definition

Interest rate on the amount to be repaid to the counterparty to the repurchase agreement when the carrying amount (or market value, if higher than the carrying amount) of securities or other assets sold under the repurchase agreement exceeds 10 percent of total assets.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(m)(1)(i)(A)(ii))
-URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690

+ Details

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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