Quarterly report pursuant to Section 13 or 15(d)

Comprehensive Income and Loss (Details Textual)

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Comprehensive Income and Loss (Details Textual) (USD $)
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Comprehensive Income and Loss (Textual) [Abstract]    
Other comprehensive income (loss) $ 0 $ 0
Comprehensive income (loss) $ 6,000,000 $ (5,200,000)