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Consolidated Statements of Comprehensive Income (Unaudited) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Consolidated Statements of Comprehensive Income [Abstract]        
Net income $ 3,743 $ 3,449 $ 1,530 $ 8,995
Unrealized gains on marketable securities 2 10 43 35
Comprehensive income $ 3,745 $ 3,459 $ 1,573 $ 9,030