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Consolidated Statements of Comprehensive Income (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Statement Of Income And Comprehensive Income [Abstract]      
Net income $ 17,892 $ 13,131 $ 14,318
Unrealized (losses) gains on marketable securities, net of tax of ($31), $36, and $20 in 2013, 2012 and 2011, respectively (49) 57 31
Comprehensive income $ 17,843 $ 13,188 $ 14,349