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Fair Value Measurements (Financial instruments level within the fair value hierarchy) (Details) - USD ($)
$ in Thousands
Sep. 30, 2022
Mar. 31, 2022
Assets:    
Short-term investments $ 2,823,208 $ 2,482,154
Fixed maturities - available for sale 2,552,311 2,821,092
Preferred stock 22,921 26,095
Common stock 40,526 46,212
Derivatives 10,167 7,474
Total 5,449,133 5,383,027
Liabilities:    
Derivatives 0 587
Total 0 587
Level 1 [Member]    
Assets:    
Short-term investments 2,821,751 2,482,154
Fixed maturities - available for sale 24,803 26,914
Preferred stock 22,921 26,095
Common stock 40,526 46,212
Derivatives 1,659 7,474
Total 2,911,660 2,588,849
Liabilities:    
Derivatives 0 0
Total 0 0
Level 2 [Member]    
Assets:    
Short-term investments 1,457 0
Fixed maturities - available for sale 2,527,416 2,794,086
Preferred stock 0 0
Common stock 0 0
Derivatives 8,508 0
Total 2,537,381 2,794,086
Liabilities:    
Derivatives 0 587
Total 0 587
Level 3 [Member]    
Assets:    
Short-term investments 0 0
Fixed maturities - available for sale 92 92
Preferred stock 0 0
Common stock 0 0
Derivatives 0 0
Total 92 92
Liabilities:    
Derivatives 0 0
Total $ 0 $ 0