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Consolidated Statements of Operations (Unaudited) (Parenthetical) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Statements of Operations [Abstract]        
Stock-based compensation $ 1,064 $ 973 $ 3,155 $ 2,614