Investments (Schedule of Amortized Cost and Estimated Fair Value of Investments) (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2023	Dec. 31, 2022	Jun. 30, 2023
Amortized Cost	$ 1,717,921	$ 1,269,735
Fixed maturities, Allowance for credit losses	(8,917)
Total fixed maturities	1,643,832	1,214,635
Mortgage loans on real estate, held for investment amortized cost	422,809
Mortgage loans on real estate, held for investment	421,232	227,047
Mortgage loan on real estate, Allowance for credit losses	(1,577)		$ (1,493)
Derivatives, Cost	37,829	30,239
Derivatives, Gross Unrealized Gains	5,296	2,694
Derivatives, Gross Unrealized Losses	(16,566)	(16,999)
Estimated Fair Value	26,559	15,934
Equity Securities, Amortized Cost	5,592	5,592
Equity securities, Gross Unrealized Losses	(480)	(481)
Equity securities, fair value	5,112	5,111
Other invested assets, Cost	126,696	108,979
Other invested assets, Allowance for credit losses	(1,600)		(1,343)
Other invested assets, Gross Unrealized Gains	2,154	3,667
Other invested assets, Gross Unrealized Losses	(473)	(215)
Other invested assets (Allowance for credit losses of $1,600 in 2023.)	126,777	112,431
Investment escrow	1,300	800
Preferred stock , Amortized cost	38,801	35,644
Preferred stock, Gross Unrealized Gains	177	1,757
Preferred stock, Gross Unrealized Losses	(5,052)	(5,986)
Preferred stock, Fair value	33,926	31,415
Deposits and notes receivable, Amortized Cost	10,774	8,359
Deposits and notes receivable, Estimated Fair Value	10,774	8,359
Notes receivable	6,500	6,300
Policy Loans	83	25
Total investments, Amortized Cost	2,360,505	1,685,620
Allowance for credit losses on investments	(10,714)		(11,752)
Investments, Gross Unrealized Gains	15,719	11,668
Investments, Gross Unrealized Losses	(97,215)	(82,331)
Investments, Fair Value Disclosure	2,268,295	1,614,957
Fixed maturities
Amortized Cost	1,717,921	1,269,735
Fixed maturities, Allowance for credit losses	(7,537)
Gross Unrealized Gains	8,092	3,550
Gross Unrealized Losses	(74,644)	(58,650)
Total fixed maturities	1,643,832	1,214,635
U.S. government obligations
Amortized Cost	1,448	1,343
Gross Unrealized Gains	521
Gross Unrealized Losses	(64)	(81)
Total fixed maturities	1,905	1,262
Mortgage-back securities
Amortized Cost	522,767	316,105
Fixed maturities, Allowance for credit losses	(386)		(1,035)
Gross Unrealized Gains	1,988	469
Gross Unrealized Losses	(42,045)	(22,508)
Total fixed maturities	482,324	294,066
Asset-backed securities
Amortized Cost	39,121	34,728
Gross Unrealized Gains	84	17
Gross Unrealized Losses	(2,831)	(3,989)
Total fixed maturities	36,374	30,756
Collateralized loan obligation
Amortized Cost	385,942	308,871
Fixed maturities, Allowance for credit losses	(613)		(480)
Gross Unrealized Gains	3,758	726
Gross Unrealized Losses	(12,363)	(21,924)
Total fixed maturities	376,724	287,673
States and Political Subdivisions - general obligations
Amortized Cost	128	104
Gross Unrealized Losses	(4)	(3)
Total fixed maturities	124	101
States and Political Subdivisions - special revenue
Amortized Cost		228
Gross Unrealized Losses		(23)
Total fixed maturities		205
Corporate
Amortized Cost	68,242	46,700
Fixed maturities, Allowance for credit losses	(1,206)		(1,297)
Gross Unrealized Gains	31	415
Gross Unrealized Losses	(5,283)	(5,515)
Total fixed maturities	61,784	41,600
Term loans
Amortized Cost	700,273	561,656
Fixed maturities, Allowance for credit losses	(5,332)		$ (6,104)
Gross Unrealized Gains	1,710	1,923
Gross Unrealized Losses	(12,054)	(4,607)
Total fixed maturities	$ 684,597	$ 558,972