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Consolidated Statements of Comprehensive Income (Unaudited) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Consolidated Statements of Comprehensive Income [Abstract]        
Net income $ 5,886 $ 3,743 $ 3,337 $ 1,530
Unrealized (losses) gains on marketable securities, net of tax (43) 2 (47) 43
Comprehensive income $ 5,843 $ 3,745 $ 3,290 $ 1,573