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Investments - Gross Unrealized Losses (Details) (Preferred Stock, USD $) In Thousands, unless otherwise specified | Sep. 30, 2013 | Jun. 30, 2013
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Preferred Stock |  |
Schedule of Trading Securities and Other Trading Assets |  |
Trading Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | $ 5,861 | $ 5,391
Trading Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses | 342 | 161
Trading Securities, Continuous Unrealized Loss Position, Fair Value | 10,706 | 7,318
Trading Securities, Continuous Unrealized Loss Position, Aggregate Losses | $ 524 | $ 228

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