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Consolidated Statements of Comprehensive Income (Unaudited) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Consolidated Statements of Comprehensive Income [Abstract]        
Net income $ 5,812 $ 5,414 $ 7,342 $ 14,409
Unrealized gains (losses) on marketable securities, net of tax (19) (96) 24 (61)
Comprehensive income $ 5,793 $ 5,318 $ 7,366 $ 14,348