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Financial Instruments Level within the Fair Value Hierarchy (Details) (USD $) In Thousands, unless otherwise specified | Jun. 30, 2013 | Mar. 31, 2013
--- | --- | ---
Assets: |  |
Short-term investments | $ 516,150 |
Fixed maturities - available for sale | 1,053,578 |
Preferred stock | 22,000 |
Common stock | 41,430 |
Derivatives | 1,212 |
Total | 1,634,370 |
Liabilities: |  |
Guaranteed residual values of TRAC leases | 0 |
Derivatives | 41,749 | 51,550
Total | 41,749 |
Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Assets: |  |
Short-term investments | 516,150 |
Fixed maturities - available for sale | 938,666 |
Preferred stock | 22,000 |
Common stock | 41,430 |
Derivatives | 0 |
Total | 1,518,246 |
Liabilities: |  |
Guaranteed residual values of TRAC leases | 0 |
Derivatives | 0 |
Total | 0 |
Significant Other Observable Inputs (Level 2) |  |
Assets: |  |
Short-term investments | 0 |
Fixed maturities - available for sale | 113,737 |
Preferred stock | 0 |
Common stock | 0 |
Derivatives | 1,212 |
Total | 114,949 |
Liabilities: |  |
Guaranteed residual values of TRAC leases | 0 |
Derivatives | 41,749 |
Total | 41,749 |
Significant Unobservable Inputs (Level 3) |  |
Assets: |  |
Short-term investments | 0 |
Fixed maturities - available for sale | 1,175 |
Preferred stock | 0 |
Common stock | 0 |
Derivatives | 0 |
Total | 1,175 |
Liabilities: |  |
Guaranteed residual values of TRAC leases | 0 |
Derivatives | 0 |
Total | $ 0 |

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