Income Taxes - Deferred Tax asset/liability (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Income Tax Examination [Line Items]
Deferred Tax Assets, Operating Loss Carryforwards	$ 84,185	$ 25,508
Deferred Tax Assets, Capital Loss Carryforwards	12,746	0
Deferred Tax Assets, Investments	(13,001)	(13,199)
Deferred Tax Assets, Gross	0	0
Deferred Tax Assets, Valuation Allowance	(83,930)	(12,309)
Deferred Tax Liabilities, Investments	0	0
Net deferred tax asset (liability), net of valuation allowance	0	0
Deferred tax liability, valuation allowance	0	0
Deferred Income Tax Liabilities, Net	0	0
Deferred Tax Assets, Capital Loss Carryforwards, Subject to Expiration	28,000
Arlington Asset Investment Corp.
Income Tax Examination [Line Items]
Deferred Tax Assets, Capital Loss Carryforwards	35,900
Deferred Tax Assets, Operating Loss Carryforwards, Domestic	45,100
State and Local Jurisdiction
Income Tax Examination [Line Items]
Unrecognized Tax Benefits	$ 20,800	$ 6,700