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Investments and Derivative Instruments - Net Realized and Unrealized Gains and Losses (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2010
Investments, Fair Value and Derivatives [Abstract]      
Unrealized gains $ 1,940 $ 865 $ 9,647
Unrealized losses (1,013) 0 0
Realized gains 1,545 447 0
Realized losses (8,647) 0 (265)
Net realized and unrealized gains (losses) (6,175) 1,312 9,382
Net gains from sales of assets 1,375 1,359 201
Other gains, net 683 1,520 586
Other, net $ (4,117) $ 4,191 $ 10,169