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Investments - Gross Unrealized Losses (Details) (Preferred Stock, USD $)
In Thousands, unless otherwise specified
Sep. 30, 2013
Jun. 30, 2013
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