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Consolidated Statements of Comprehensive Income (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Consolidated Statements of Comprehensive Income [Abstract]      
Net income $ 13,131 $ 14,318 $ 7,353
Reclassification of realized gains on marketable securities, net of tax of ($161) in 2010 0 0 (245)
Unrealized gains (losses) on marketable securities, net of tax of $36, $20 and ($50) in 2012, 2011 and 2010, respectively 57 31 (76)
Comprehensive income $ 13,188 $ 14,349 $ 7,032