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Fair Value Measurements (Financial instruments level within the fair value hierarchy) (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Mar. 31, 2021
--- | --- | ---
Assets: |  |
Short-term investments | $ 2,102,275 | $ 839,250
Fixed maturities - available for sale | 2,743,151 | 2,653,539
Preferred stock | 28,112 | 21,677
Common stock | 24,179 | 20,440
Derivatives | 6,557 | 6,601
Total | 4,904,274 | 3,541,507
Liabilities: |  |
Derivatives | 2,051 | 5,141
Total | 2,051 | 5,141
Level 1 [Member] |  |
Assets: |  |
Short-term investments | 2,102,275 | 839,250
Fixed maturities - available for sale | 17,103 | 6,967
Preferred stock | 28,112 | 21,677
Common stock | 24,179 | 20,440
Derivatives | 6,557 | 6,601
Total | 2,178,226 | 894,935
Liabilities: |  |
Derivatives | 0 | 0
Total | 0 | 0
Level 2 [Member] |  |
Assets: |  |
Short-term investments | 0 | 0
Fixed maturities - available for sale | 2,725,938 | 2,646,415
Preferred stock | 0 | 0
Common stock | 0 | 0
Derivatives | 0 | 0
Total | 2,725,938 | 2,646,415
Liabilities: |  |
Derivatives | 2,051 | 5,141
Total | 2,051 | 5,141
Level 3 [Member] |  |
Assets: |  |
Short-term investments | 0 | 0
Fixed maturities - available for sale | 110 | 157
Preferred stock | 0 | 0
Common stock | 0 | 0
Derivatives | 0 | 0
Total | 110 | 157
Liabilities: |  |
Derivatives | 0 | 0
Total | $ 0 | $ 0

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