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Fair Value Measurements (Financial instruments level within the fair value hierarchy) (Details) - USD ($) $ in Thousands | Jun. 30, 2015 | Jun. 30, 2014
--- | --- | ---
Assets: |  |
Short-term investments | $ 391,113 | $ 460,762
Fixed maturities - available for sale | 1,290,830 | 1,262,012
Preferred stock | 18,552 | 18,296
Common stock | 24,817 | 24,654
Derivatives | 4,351 | 4,876
Total | $ 1,729,663 | $ 1,770,600
Liabilities: |  |
Guaranteed residual values of TRAC leases |  |
Derivatives | $ 21,121 | $ 24,484
Total | 21,121 | 24,484
Level 1 [Member] |  |
Assets: |  |
Short-term investments | 391,113 | 460,762
Fixed maturities - available for sale | 1,007,559 | 967,986
Preferred stock | 18,552 | 18,296
Common stock | 24,817 | 24,654
Derivatives | 4,351 | 4,876
Total | $ 1,446,392 | $ 1,476,574
Liabilities: |  |
Guaranteed residual values of TRAC leases |  |
Derivatives |  |
Total |  |
Level 2 [Member] |  |
Assets: |  |
Short-term investments |  |
Fixed maturities - available for sale | $ 282,315 | $ 293,022
Preferred stock |  |
Common stock |  |
Derivatives |  |
Total | $ 282,315 | $ 293,022
Liabilities: |  |
Guaranteed residual values of TRAC leases |  |
Derivatives | $ 21,121 | $ 24,484
Total | $ 21,121 | $ 24,484
Level 3 [Member] |  |
Assets: |  |
Short-term investments |  |
Fixed maturities - available for sale | $ 956 | $ 1,004
Preferred stock |  |
Common stock |  |
Derivatives |  |
Total | $ 956 | $ 1,004
Liabilities: |  |
Guaranteed residual values of TRAC leases |  |
Derivatives |  |
Total |  |

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