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Strategic Investments and Fair Value of Financial Instruments (Details 2) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2011
Sep. 30, 2011
Dec. 31, 2010
Summary of Recorded value and fair value of strategic investments      
Recorded value $ 117,820 $ 120,319 $ 108,959
Albemarle & Bond Holdings [Member]
     
Summary of Recorded value and fair value of strategic investments      
Recorded value 49,616 48,361 45,684
Fair value 84,622 91,741 81,630
Cash Converters International Limited [Member]
     
Summary of Recorded value and fair value of strategic investments      
Recorded value 68,204 71,958 63,275
Fair value $ 68,355 $ 53,600 $ 88,512