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Consolidated Statements Of Comprehensive Income (Loss) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Consolidated Statements Of Comprehensive Income (Loss) [Abstract]      
Net income (loss) $ 14,318 $ 7,353 $ (3,945)
Reclassification of realized gains on marketable securities, net of tax of $(161) in 2010 0 (245) 0
Unrealized gains (losses) on marketable securities, net of tax of $20, ($50) and $152 in 2011, 2010, and 2009, respectively 31 (76) 231
Comprehensive income (loss) $ 14,349 $ 7,032 $ (3,714)