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Fair Value Measurements (Financial instruments level within the fair value hierarchy) (Details) - USD ($) $ in Thousands	Mar. 31, 2025	Mar. 31, 2024
Assets:
Fixed maturities - available for sale	$ 2,479,498	$ 2,442,504
Preferred stock	22,136	21,260
Common stock	43,413	45,014
Derivatives	13,200	18,930
Total	2,558,247	2,527,708
Liabilities [Abstract]
Notional amount (debt)	777
Embedded derivatives	8,693	9,300
Market risk benefits	13,432	13,400
Liabilities, Fair Value Disclosure	22,902	22,700
Level 1 [Member]
Assets:
Preferred stock	22,136	21,260
Common stock	43,413	45,014
Derivatives	8,819	10,538
Total	74,368	76,812
Level 2 [Member]
Assets:
Fixed maturities - available for sale	2,479,498	2,442,446
Derivatives	4,381	8,392
Total	2,483,879	2,450,838
Liabilities [Abstract]
Notional amount (debt)	777
Liabilities, Fair Value Disclosure	777
Level 3 [Member]
Assets:
Fixed maturities - available for sale		58
Total		58
Liabilities [Abstract]
Embedded derivatives	8,693	9,300
Market risk benefits	13,432	$ 13,400
Liabilities, Fair Value Disclosure	$ 22,125

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