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Investments and Derivative Instruments - Gross Unrealized Losses (Details) (Preferred Stock, USD $) In Thousands, unless otherwise specified | Jun. 30, 2012 | Jun. 30, 2011
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Preferred Stock |  |
Schedule of Trading Securities and Other Trading Assets |  |
Less than 12 Months, Fair Value | $ 1,750 | $ 319
Less than 12 Months, Unrealized Loss | (16) | (3)
Fair Value | 2,891 | 6,326
Unrealized Loss | $ (40) | $ (1,122)

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