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Consolidated Statements of Income - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Revenues      
Recurring $ 425,424 $ 323,548 $ 219,987
Implementation and other 7,623 5,593 4,666
Total revenues 433,047 329,141 224,653
Cost of revenues      
Operating expenses 62,438 48,268 31,790
Depreciation and amortization 9,590 5,798 3,683
Total cost of revenues 72,028 54,066 35,473
Administrative expenses      
Sales and marketing 150,512 119,258 92,554
Research and development 30,430 20,966 8,627
General and administrative 91,647 69,046 47,826
Depreciation and amortization 9,805 7,834 5,738
Total administrative expenses 282,394 217,104 154,745
Total operating expenses 354,422 271,170 190,218
Operating income 78,625 57,971 34,435
Interest expense (911) (1,036) (1,427)
Other income, net (1,067) 308 517
Income before income taxes 76,647 57,243 33,525
Provision for income taxes 9,840 13,403 12,580
Net income $ 66,807 $ 43,840 $ 20,945
Earnings per share, basic $ 1.15 $ 0.76 $ 0.37
Earnings per share, diluted $ 1.13 $ 0.74 $ 0.36
Weighted average shares outstanding:      
Basic 57,839,155 57,550,204 56,495,170
Diluted 58,790,019 58,968,099 57,919,700