Significant Accounting Policies and Pronouncements (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Jan. 01, 2021	Jan. 01, 2020
Accounting Policies [Abstract]
Commercial mortgage and other loans, Loan-to-value ratios (greater than)	100.00%
Commercial mortgage and other loans, Loan-to-value ratios (less than)	100.00%
Commercial mortgage and other loans, Debt service coverage ratios (less than)	1.0
Commercial mortgage and agricultural mortgage loans, Debt service coverage ratios (greater than)	1.0
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Retained earnings / (accumulated deficit)	$ (95,583)	$ (437,332)
Deposit assets related to reinsurance agreement	828,000	497,000
Ceded Reserve Liabilities under Reinsurance Agreement	$ 705,000	$ 419,000
Uncertain tax positions measurement percentage (greater than)	50.00%
Securities Loaned Transactions Collateral Fair Value of Domestic Securities	102.00%
Securities Loaned Transactions Collateral Fair Value of Foreign Securities	105.00%
Minimum
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Repurchase and Resale Agreements, Collateral, Percentage	95.00%
Accounting Standards Update 2018-12 | Minimum
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total equity			$ (700,000)
Accounting Standards Update 2018-12 | Maximum
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total equity			$ 100,000
Cumulative effect adjustment to opening balance | ASU 2016-13
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Retained earnings / (accumulated deficit)				$ 1,800