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Condensed Consolidated Statements of Operations (Parenthetical) (Unaudited) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Condensed Consolidated Statements of Operations [Abstract]        
Accretion of issuance cost of preferred dividends $ 77 $ 118 $ 154 $ 236