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Fair Value Measurements (Financial Instruments Level within the Fair Value Hierarchy) (Details) - USD ($) $ in Thousands | Mar. 31, 2016 | Mar. 31, 2015
--- | --- | ---
Assets: |  |
Short-term investments | $ 499,491 | $ 460,762
Fixed maturities - available for sale | 1,466,941 | 1,262,012
Preferred stock | 18,428 | 18,296
Common stock | 25,169 | 24,654
Derivatives | 3,344 | 4,876
Total | $ 2,013,373 | $ 1,770,600
Liabilities: |  |
Guaranteed residual values of TRAC leases |  |
Derivatives | $ 14,845 | $ 24,484
Total | 14,845 | 24,484
Level 1 [Member] |  |
Assets: |  |
Short-term investments | 499,491 | 460,762
Fixed maturities - available for sale | 96,328 | 101,201
Preferred stock | 18,428 | 18,296
Common stock | 25,169 | 24,654
Derivatives | 3,344 | 4,876
Total | $ 642,760 | $ 609,789
Liabilities: |  |
Guaranteed residual values of TRAC leases |  |
Derivatives |  |
Total |  |
Level 2 [Member] |  |
Assets: |  |
Short-term investments |  |
Fixed maturities - available for sale | $ 1,370,275 | $ 1,159,807
Preferred stock |  |
Common stock |  |
Derivatives |  |
Total | $ 1,370,275 | $ 1,159,807
Liabilities: |  |
Guaranteed residual values of TRAC leases |  |
Derivatives | $ 14,845 | $ 24,484
Total | $ 14,845 | $ 24,484
Level 3 [Member] |  |
Assets: |  |
Short-term investments |  |
Fixed maturities - available for sale | $ 338 | $ 1,004
Preferred stock |  |
Common stock |  |
Derivatives |  |
Total | $ 338 | $ 1,004
Liabilities: |  |
Guaranteed residual values of TRAC leases |  |
Derivatives |  |
Total |  |

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