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Fair Value Measurements (Financial instruments level within the fair value hierarchy) (Details) - USD ($) $ in Thousands | Sep. 30, 2017 | Mar. 31, 2017
--- | --- | ---
Assets: |  |
Short-term investments | $ 541,976 | $ 521,911
Fixed maturities - available for sale | 1,804,501 | 1,625,845
Preferred stock | 14,303 | 13,489
Common stock | 24,964 | 24,434
Derivatives | 3,603 | 4,260
Total | 2,389,347 | 2,189,939
Liabilities: |  |
Guaranteed residual values of TRAC leases |  |
Derivatives | 2,167 | 4,903
Total | 2,167 | 4,903
Level 1 [Member] |  |
Assets: |  |
Short-term investments | 541,776 | 521,710
Fixed maturities - available for sale | 6,850 | 6,491
Preferred stock | 14,303 | 13,489
Common stock | 24,964 | 24,434
Derivatives | 3,603 | 4,260
Total | 591,496 | 570,384
Liabilities: |  |
Guaranteed residual values of TRAC leases |  |
Derivatives |  |
Total |  |
Level 2 [Member] |  |
Assets: |  |
Short-term investments | 200 | 201
Fixed maturities - available for sale | 1,797,323 | 1,619,024
Preferred stock |  |
Common stock |  |
Derivatives |  |
Total | 1,797,523 | 1,619,225
Liabilities: |  |
Guaranteed residual values of TRAC leases |  |
Derivatives | 2,167 | 4,903
Total | 2,167 | 4,903
Level 3 [Member] |  |
Assets: |  |
Short-term investments |  |
Fixed maturities - available for sale | 328 | 330
Preferred stock |  |
Common stock |  |
Derivatives |  |
Total | 328 | 330
Liabilities: |  |
Guaranteed residual values of TRAC leases |  |
Derivatives |  |
Total |  |

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