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Fair Value Measurements (Financial instruments level within the fair value hierarchy) (Details) - USD ($) $ in Thousands | Dec. 31, 2016 | Mar. 31, 2016
--- | --- | ---
Assets: |  |
Short-term investments | $ 886,301 | $ 499,491
Fixed maturities - available for sale | 1,659,324 | 1,466,941
Preferred stock | 15,036 | 18,428
Common stock | 26,221 | 25,169
Derivatives | 4,119 | 3,344
Total | 2,591,001 | 2,013,373
Liabilities: |  |
Guaranteed residual values of TRAC leases |  |
Derivatives | 6,785 | 14,845
Total | 6,785 | 14,845
Level 1 [Member] |  |
Assets: |  |
Short-term investments | 886,100 | 499,288
Fixed maturities - available for sale | 98,330 | 96,328
Preferred stock | 15,036 | 18,428
Common stock | 26,221 | 25,169
Derivatives | 4,119 | 3,344
Total | 1,029,806 | 642,557
Liabilities: |  |
Guaranteed residual values of TRAC leases |  |
Derivatives |  |
Total |  |
Level 2 [Member] |  |
Assets: |  |
Short-term investments | 201 | 203
Fixed maturities - available for sale | 1,560,662 | 1,370,275
Preferred stock |  |
Common stock |  |
Derivatives |  |
Total | 1,560,863 | 1,370,478
Liabilities: |  |
Guaranteed residual values of TRAC leases |  |
Derivatives | 6,785 | 14,845
Total | 6,785 | 14,845
Level 3 [Member] |  |
Assets: |  |
Short-term investments |  |
Fixed maturities - available for sale | 332 | 338
Preferred stock |  |
Common stock |  |
Derivatives |  |
Total | 332 | 338
Liabilities: |  |
Guaranteed residual values of TRAC leases |  |
Derivatives |  |
Total |  |

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