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Condensed Consolidated Statements of Operations (Unaudited) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Income Statement [Abstract]    
Revenues $ 40,195 $ 42,177
Cost of revenues 4,777 3,985
Gross profit 35,418 38,192
Operating expenses:    
Sales and marketing 17,843 19,659
General and administrative 10,578 10,497
Total operating expenses 28,421 30,156
Income from operations 6,997 8,036
Other income 122 31
Income before income taxes 7,119 8,067
Income taxes 2,481 2,472
Net income $ 4,638 $ 5,595
Basic net income (loss) per share (in dollars per share) $ 0.31 $ 0.36
Diluted net income per share $ 0.31 $ 0.36
Shares used in computing basic net income (loss) per share (in shares) 14,880 15,362
Shares used in computing diluted net income (loss) per share (in shares) 14,970 15,371