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Fair Value of Financial Instruments (Details Textual) (Fair value on non-recurring basis [Member], USD $)
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Jun. 30, 2012
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Dec. 31, 2011
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|---|---|---|
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Fair value on non-recurring basis [Member]
|
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| Fair Value of Financial Instruments (Textual) [Abstract] | ||
| Non-financial assets or liabilities | $ 0 | $ 0 |