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Fair Value Measurements (Financial Instruments Level within the Fair Value Hierarchy) (Details) - USD ($) $ in Thousands | Mar. 31, 2017 | Mar. 31, 2016
--- | --- | ---
Assets: |  |
Short-term investments | $ 521,911 | $ 499,491
Fixed maturities - available for sale | 1,625,845 | 1,448,941
Preferred stock | 13,489 | 18,428
Common stock | 24,434 | 23,420
Derivatives | 4,260 | 3,344
Total | 2,189,939 | 1,993,624
Liabilities: |  |
Guaranteed residual values of TRAC leases |  |
Derivatives | 4,903 | 14,845
Total | 4,903 | 14,845
Level 1 [Member] |  |
Assets: |  |
Short-term investments | 521,710 | 499,491
Fixed maturities - available for sale | 6,491 | 96,328
Preferred stock | 13,489 | 18,428
Common stock | 24,434 | 23,420
Derivatives | 4,260 | 3,344
Total | 570,384 | 641,011
Liabilities: |  |
Guaranteed residual values of TRAC leases |  |
Derivatives |  |
Total |  |
Level 2 [Member] |  |
Assets: |  |
Short-term investments | 201 |
Fixed maturities - available for sale | 1,619,024 | 1,352,275
Preferred stock |  |
Common stock |  |
Derivatives |  |
Total | 1,619,225 | 1,352,275
Liabilities: |  |
Guaranteed residual values of TRAC leases |  |
Derivatives | 4,903 | 14,845
Total | 4,903 | 14,845
Level 3 [Member] |  |
Assets: |  |
Short-term investments |  |
Fixed maturities - available for sale | 330 | 338
Preferred stock |  |
Common stock |  |
Derivatives |  |
Total | 330 | 338
Liabilities: |  |
Guaranteed residual values of TRAC leases |  |
Derivatives |  |
Total |  |

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