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Derivative Instruments and Hedging Activities (Details) (Non-designated derivatives [Member], Gold collar [Member], Other Income (Expense) [Member], USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2013	Mar. 31, 2012
Non-designated derivatives [Member] \| Gold collar [Member] \| Other Income (Expense) [Member]
Fair value of the Company's derivative financial instruments on the consolidated statement of operations
(Gains) Losses Recognized in Income	$ 0	$ 922	$ 0	$ (151)

The amount of net gains and losses recognized in income during the period on derivative instruments designated and qualifying as hedging instruments in fair value hedges and related hedged items designated and qualifying in fair value hedges, on derivative instruments designated and qualifying as hedging instruments in cash flow hedges, and on derivative instruments not designated as hedging instruments.

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