Derivative Instruments (Details 1) (USD $)	3 Months Ended
Mar. 31, 2013	Mar. 31, 2012
Derivative [Line Items]
Realized and unrealized gain on derivatives	$ (439,000)	$ 898,000
Gain(Loss) on Derivative Instruments, Including Interest Income (Expense), Net, Pretax	(716,000)	898,000
Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Gain(Loss) on Derivative Instruments, Including Interest Income (Expense), Net, Pretax	(716,000)	898,000
Futures and Forwards Contracts [Member] \| Gold, Ounces
Derivative [Line Items]
Forward and future contracts	1,600,000
Futures and Forwards Contracts [Member] \| Silver, Ounces
Derivative [Line Items]
Forward and future contracts	4,800,000
Futures and Forwards Contracts [Member] \| Not Designated as Hedging Instrument [Member] \| Gold, Ounces
Derivative [Line Items]
Outstanding forward and future contracts (in ounces)	1,000
Futures and Forwards Contracts [Member] \| Not Designated as Hedging Instrument [Member] \| Silver, Ounces
Derivative [Line Items]
Outstanding forward and future contracts (in ounces)	165,000
Realized and Unrealized Gain (Loss) on Derivatives [Member] \| Not Designated as Hedging Instrument [Member] \| Commodity Contracts [Member]
Derivative [Line Items]
Gain(Loss) on Derivative Instruments, Including Interest Income (Expense), Net, Pretax	$ 354,000	$ 257,000

Gain(Loss) on Derivative Instruments, Including Interest Income (Expense), Net, Pretax

No definition available.

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- Definition

Aggregate notional amount of derivative expressed in nonmonetary units. For example, the number of barrels specified in a fuel oil forward purchase contract.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Article 12

-Section 13

-Sentence Column B

+ Details

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- Details

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- Definition

Aggregate net gain (loss) on all derivative instruments recognized in earnings during the period, before tax effects.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 4A

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5618551-113959

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- Definition

Fair value as of the balance sheet date of all price risk derivatives not designated as hedging instruments.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 45

-Paragraph 5

-URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 133

-Paragraph 17

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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