Derivative Instruments (Details 3) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Derivatives, Fair Value [Line Items]
Total derivatives	$ (189)	$ 893
Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Total derivatives	(189)	893
Not Designated as Hedging Instrument [Member] | Commodity Contracts [Member] | Other Current Assets (Liabilities) [Member]
Derivatives, Fair Value [Line Items]
Total derivatives	88	100
Not Designated as Hedging Instrument [Member] | Interest Rate Swap [Member] | Other Current Assets (Liabilities) [Member]
Derivatives, Fair Value [Line Items]
Total derivatives		0
Not Designated as Hedging Instrument [Member] | Derivative Features of Subordinated Notes [Member] | Long-term Debt & Long Term Debt-Related Party [Member]
Derivatives, Fair Value [Line Items]
Total derivatives	0	793
Level 2 [Member] | Recurring [Member] | Commodity Contracts [Member]
Derivatives, Fair Value [Line Items]
Commodity contracts on precious metal and derivative features of Subordinated Notes	0	(27)
Level 2 [Member] | Recurring [Member] | Interest Rate Swap [Member]
Derivatives, Fair Value [Line Items]
Commodity contracts on precious metal and derivative features of Subordinated Notes	(277)
Level 2 [Member] | Recurring [Member] | Derivative Features of Subordinated Notes [Member]
Derivatives, Fair Value [Line Items]
Commodity contracts on precious metal and derivative features of Subordinated Notes		$ 0