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Investments and Derivative Instruments - Narrative (Details) (Preferred Stock, USD $) | Sep. 30, 2012 | Jun. 30, 2012
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Preferred Stock |  |
Schedule of Trading Securities and Other Trading Assets |  |
Fair value of trading securities in unrealized gain position | $ 18,400,000 | $ 16,500,000
Fair value of trading securities in unrealized loss position | $ 1,806,000 | $ 2,891,000

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