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Derivative Instruments and Hedging Activities (Tables)
3 Months Ended
Mar. 31, 2012
Derivative Instruments and Hedging Activities [Abstract]  
Fair value of the Company's derivative financial instruments on the consolidated statement of operations
                                     
        (Gains) Losses Recognized in Income  
         Three Months Ended March 31,     Six Months Ended March 31,  

Derivative Instrument

 

Location of (Gain) or Loss

  2012     2011     2012     2011  
        (In thousands)  

Non-designated derivatives:

                                   

Gold Collar

  Other (income) expense   $ 922     $ —       $ (151   $ —