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Consolidated Statements of Operations (Unaudited) (Parenthetical) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Statements of Operations [Abstract]        
Stock-based compensation $ 1,724 $ 1,134 $ 3,563 $ 2,091