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Subsequent Event (Details Textual) (USD $)
In Millions, except Share data, unless otherwise specified
1 Months Ended 6 Months Ended
Jul. 31, 2012
Jun. 30, 2012
Subsequent Event (Textual) [Abstract]    
Shares repurchased of outstanding series D perpetual preferred stock, liquidation value   $ 12.3
Shares repurchased of outstanding series D perpetual preferred stock, shares   123
Amount paid in accrued dividends $ 7.7