Debt (Tower Securities - Schedule of Material Terms of Debt Repaid) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Debt Instrument [Line Items]
Amount Outstanding	$ 12,388,000	$ 12,952,000
2013-2C Tower Securities [Member]
Debt Instrument [Line Items]
Issue Date	Apr. 18, 2013
Amount Outstanding	$ 575,000
Interest Rate	3.722%
Anticipated Repayment Date	Apr. 11, 2023
Actual Repayment Date	Oct. 14, 2021
Financing fees	$ 11,000
Deferred financing fees and accrued interest	$ 2,000
2017-1C Tower Securities [Member]
Debt Instrument [Line Items]
Issue Date	Apr. 17, 2017
Amount Outstanding	$ 760,000
Interest Rate	3.168%
Anticipated Repayment Date	Apr. 11, 2022
Actual Repayment Date	May 14, 2021
Financing fees	$ 10,200
Deferred financing fees and accrued interest	$ 2,000
2018-1C Tower Securities [Member]
Debt Instrument [Line Items]
Issue Date	Mar. 09, 2018
Amount Outstanding	$ 640,000
Interest Rate	3.448%
Anticipated Repayment Date	Mar. 09, 2023
Actual Repayment Date	Dec. 15, 2022
Financing fees	$ 8,600
Deferred financing fees and accrued interest	$ 400