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Investments - Narrative (Details) (Preferred Stock, USD $)
Jun. 30, 2013
Jun. 30, 2012
Preferred Stock
   
Schedule of Trading Securities and Other Trading Assets    
Fair value of trading securities in unrealized gain position $ 13,200,000 $ 16,500,000
Fair value of trading securities in unrealized loss position $ 7,318,000 $ 2,891,000