Allowance For Credit Losses (Reserve Allowance For Various Credit Loss) (Details) - USD ($) $ in Thousands	3 Months Ended
	Jun. 30, 2022	Jun. 30, 2021
Valuation And Qualifying Accounts [Abstract]
March 31, 2021	$ 9,210	$ 4,656
Transition adjustment current expected credit losses	(6,146)	(566)
Write-offs against allowance	0	0
Recoveries	0	0
June 30, 2021	3,064	4,090
Trade Receivables
Valuation And Qualifying Accounts [Abstract]
March 31, 2021	8,649	2,835
Transition adjustment current expected credit losses	(6,162)	(291)
Write-offs against allowance	0	0
Recoveries	0	0
June 30, 2021	2,487	2,544
Investments, Fixed Maturities
Valuation And Qualifying Accounts [Abstract]
March 31, 2021	60	1,320
Transition adjustment current expected credit losses	17	(279)
Write-offs against allowance	0	0
Recoveries	0	0
June 30, 2021	77	1,041
Investments, Other
Valuation And Qualifying Accounts [Abstract]
March 31, 2021	501	501
Transition adjustment current expected credit losses	(1)	4
Write-offs against allowance	0	0
Recoveries	0	0
June 30, 2021	$ 500	$ 505