Debt (Risk Retention Tower Securities - Schedule of Material Terms of Debt Outstanding) (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2022	Dec. 31, 2021
Debt Instrument [Line Items]
Amount Outstanding	$ 12,952,000	$ 12,396,000
2019-1R Tower Securities [Member]
Debt Instrument [Line Items]
Issue Date	Sep. 13, 2019
Amount Outstanding	$ 61,400
Interest Rate	4.213%
Anticipated Repayment Date	Jan. 12, 2025
Final Maturity Date	Jan. 12, 2050
2020-2R Tower Securities [Member]
Debt Instrument [Line Items]
Issue Date	Jul. 14, 2020
Amount Outstanding	$ 71,100
Interest Rate	4.336%
Anticipated Repayment Date	Jan. 11, 2028
Final Maturity Date	Jul. 09, 2052
2021-1R Tower Securities [Member]
Debt Instrument [Line Items]
Issue Date	May 14, 2021
Amount Outstanding	$ 61,400
Interest Rate	3.598%
Anticipated Repayment Date	Nov. 09, 2026
Final Maturity Date	May 09, 2051
2021-3R Tower Securities [Member]
Debt Instrument [Line Items]
Issue Date	Oct. 27, 2021
Amount Outstanding	$ 94,300
Interest Rate	4.09%
Anticipated Repayment Date	Oct. 09, 2031
Final Maturity Date	Oct. 10, 2056
2022-1R Tower Securities [Member]
Debt Instrument [Line Items]
Issue Date	Nov. 23, 2022
Amount Outstanding	$ 44,800
Interest Rate	7.87%
Anticipated Repayment Date	Jan. 11, 2028
Final Maturity Date	Nov. 09, 2052

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- Definition

Face (par) amount of debt instrument at time of issuance.

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- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

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- Definition

Date the debt instrument was issued, in YYYY-MM-DD format.

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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.

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- Definition

Date when the debt instrument is scheduled to be fully repaid, in YYYY-MM-DD format.

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