Annual report pursuant to Section 13 and 15(d)

Revenue Recognition - Effect of Adoption of 2014-09 on Financial Statements (Details)

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Revenue Recognition - Effect of Adoption of 2014-09 on Financial Statements (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Jan. 01, 2018
Revenue                        
Total revenue                 $ 869,480 $ 670,963 $ 568,128  
Operating expenses:                        
Sales and marketing                 166,607 140,473 122,457  
Net income before income taxes                 34,300 15,241 27,486  
Income tax (benefit) expense                 (425) 14,864 10,836  
Net income $ 6,272 $ 9,073 $ 8,479 $ 10,901 $ (20,865) $ 6,834 $ 6,213 $ 8,195 34,725 377 16,650  
Assets                        
Accounts receivable, less allowances 123,596       124,505       123,596 124,505   $ 116,580
Other current assets 15,185       6,622       15,185 6,622   9,393
Other assets 20,393       11,010       20,393 11,010   15,469
Liabilities                        
Current portion of deferred revenue 120,704       116,622       120,704 116,622   112,926
Deferred revenue 4,902       5,538       4,902 5,538    
Balances without adoption of ASU 2014-09                        
Assets                        
Accounts receivable, less allowances         124,505         124,505    
Other current assets         6,622         6,622    
Other assets         11,010         11,010    
Liabilities                        
Current portion of deferred revenue         116,622         116,622    
Balances without adoption of ASU 2014-09 | Adjustments due to ASU 2014-09                        
Operating expenses:                        
Sales and marketing                 174,578      
Net income before income taxes                 25,200      
Income tax (benefit) expense                 (2,608)      
Net income                 27,808      
Assets                        
Accounts receivable, less allowances 130,742               130,742      
Other current assets 8,198               8,198      
Other assets 12,114               12,114      
Liabilities                        
Current portion of deferred revenue 125,078               125,078      
Deferred revenue 4,902               4,902      
Effect of Change on Net Income Higher/(Lower) | Adjustments due to ASU 2014-09                        
Operating expenses:                        
Sales and marketing                 7,971      
Net income before income taxes                 9,100      
Income tax (benefit) expense                 2,183      
Net income                 6,917      
Assets                        
Accounts receivable, less allowances (7,146)               (7,146)     (7,925)
Other current assets 6,987               6,987     2,771
Other assets 8,279               8,279     4,459
Liabilities                        
Current portion of deferred revenue (4,374)               (4,374)     $ (3,696)
Deferred revenue 0               0      
On demand                        
Revenue                        
Total revenue 218,051 215,413 206,945 193,300 180,104 161,578 154,727 146,213 833,709 642,622 542,531  
On demand | Balances without adoption of ASU 2014-09 | Adjustments due to ASU 2014-09                        
Revenue                        
Total revenue                 835,465      
On demand | Effect of Change on Net Income Higher/(Lower) | Adjustments due to ASU 2014-09                        
Revenue                        
Total revenue                 (1,756)      
Professional and other                        
Revenue                        
Total revenue 8,923 9,540 9,307 8,001 7,576 7,480 6,579 6,706 35,771 28,341 25,597  
Professional and other | Balances without adoption of ASU 2014-09 | Adjustments due to ASU 2014-09                        
Revenue                        
Total revenue                 32,886      
Professional and other | Effect of Change on Net Income Higher/(Lower) | Adjustments due to ASU 2014-09                        
Revenue                        
Total revenue                 2,885      
Service                        
Revenue                        
Total revenue $ 226,974 $ 224,953 $ 216,252 $ 201,301 $ 187,680 $ 169,058 $ 161,306 $ 152,919 869,480 $ 670,963 $ 568,128  
Service | Balances without adoption of ASU 2014-09 | Adjustments due to ASU 2014-09                        
Revenue                        
Total revenue                 868,351      
Service | Effect of Change on Net Income Higher/(Lower) | Adjustments due to ASU 2014-09                        
Revenue                        
Total revenue                 $ 1,129