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Consolidated Statements of Comprehensive Income (Loss) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Statement Of Income And Comprehensive Income [Abstract]        
Net income (loss) $ 4,686 $ (1,480) $ 7,031 $ (3,940)
Unrealized gain (loss) on marketable securities available for sale:        
Unrealized holding gain (loss) arising during the period 91    (72)   
Reclassification adjustment for gains included in net income       (19)   
Unrealized gain (loss) on marketable securities, net 91    (91)   
Comprehensive income (loss) $ 4,777 $ (1,480) $ 6,940 $ (3,940)