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Consolidated Statements of Comprehensive Income (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Statement Of Income And Comprehensive Income [Abstract]        
Net income $ 5,622 $ 7,769 $ 7,963 $ 10,950
Other comprehensive income (loss), net of taxes:        
Cumulative translation adjustments 16 (1,013) (1,339) (332)
Changes in market value of investments:        
Unrealized gain (loss), net of taxes (benefits) of $(238) and $26 for the three months ended June 30, 2013 and 2012, and $(241) and $166 for the six months ended June 30, 2013 and 2012 (394) 17 (440) 333
Less: reclassification adjustment for net gains realized in net income, net of taxes of $15 and $2 for the three months ended June 30, 2013 and 2012, and $15 and $10 for the six months ended June 30, 2013 and 2012 24 (1) 24 (14)
Net change in market value of investments (370) 16 (416) 319
Other comprehensive income (loss) (354) (997) (1,755) (13)
Comprehensive income $ 5,268 $ 6,772 $ 6,208 $ 10,937