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Condensed Consolidated Statements of Income (Unaudited) (USD $)
In Thousands, except Per Share data, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Income Statement [Abstract]        
Operating revenue $ 51,004 $ 47,716 $ 103,570 $ 91,543
Operating expenses:        
Cost of services provided 10,358 9,157 20,249 18,186
Product development 6,724 5,814 13,759 10,086
Sales and marketing 3,827 4,296 7,739 8,108
General and administrative 8,253 8,577 18,224 15,021
Amortization and depreciation 2,548 2,161 5,000 4,102
Total operating expenses 31,710 30,005 64,971 55,503
Operating income 19,294 17,711 38,599 36,040
Interest income 91 110 184 277
Interest expense (281) (312) (643) (565)
Other non-operating income (loss) (1,425) 262 (1,343) 262
Foreign currency exchange gain (loss) (123) 2,591 (293) 2,295
Income before income taxes 17,556 20,362 36,504 38,309
Income tax expense (4,014) (2,295) (5,618) (4,557)
Net income $ 13,542 $ 18,067 $ 30,886 $ 33,752
Basic earnings per common share $ 0.36 $ 0.49 $ 0.83 $ 0.92
Diluted earnings per common share $ 0.35 $ 0.47 $ 0.80 $ 0.86
Basic weighted average shares outstanding 37,210 36,908 37,189 36,679
Diluted weighted average shares outstanding 38,789 38,827 38,784 39,175