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Debt - Schedule of Senior Securities (Including Debt Securities and Other Indebtedness) (Parenthetical) (Details) - Senior Notes - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2025	Dec. 31, 2019	Dec. 31, 2017	Dec. 31, 2016
Debt Instrument [Line Items]
Amount of asset coverage per unit expressed indebtedness	$ 1,000
Amount of indebtedness	$ 1
8.25% Notes due 2020
Debt Instrument [Line Items]
Debt instrument, interest rate				8.25%
6.50% Notes due 2022
Debt Instrument [Line Items]
Debt instrument, interest rate			6.50%
6.50% Notes due 2024
Debt Instrument [Line Items]
Debt instrument, interest rate		6.50%

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