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Strategic Investments (Details 2) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Sep. 30, 2012
Dec. 31, 2011
Summary of Recorded value and fair value of strategic investments      
Recorded value $ 144,232 $ 126,066 $ 117,820
Albemarle & Bond Holdings [Member]
     
Summary of Recorded value and fair value of strategic investments      
Recorded value 54,559 51,812 49,616
Fair value 57,402 65,109 84,622
Cash Converters International Limited [Member]
     
Summary of Recorded value and fair value of strategic investments      
Recorded value 89,673 74,254 68,204
Fair value $ 164,633 $ 100,705 $ 68,355