Quarterly report pursuant to Section 13 or 15(d)

Summary of Significant Accounting Policies - Schedule of Adjustments Due to Change in Accounting Policy (Details)

v3.8.0.1
Summary of Significant Accounting Policies - Schedule of Adjustments Due to Change in Accounting Policy (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Jan. 01, 2018
Dec. 31, 2017
Dec. 31, 2016
Assets          
Accounts receivable, less allowance for doubtful accounts $ 101,005   $ 116,580 $ 124,505  
Other current assets 9,838   9,393 6,622  
Deferred tax assets, net 45,205   44,107 44,887  
Other assets 19,533   15,469 11,010  
Liabilities          
Current portion of deferred revenue 109,965   112,926 116,622  
Stockholders’ equity:          
Accumulated deficit (61,924)   (72,825) (75,046)  
Statement of Cash Flows for the three months ended March 31, 2017          
Net cash provided by operating activities 70,771 $ 46,983      
Cash, cash equivalents and restricted cash at end of period 214,124 155,946   165,345 $ 188,540
Scenario, Previously Reported          
Statement of Cash Flows for the three months ended March 31, 2017          
Net cash provided by operating activities   34,207      
Cash, cash equivalents and restricted cash at end of period   59,516      
Adjustments due to accounting standards update 2016-18          
Statement of Cash Flows for the three months ended March 31, 2017          
Net cash provided by operating activities   12,776      
Cash, cash equivalents and restricted cash at end of period   $ 96,430      
Balances without adoption of ASU 2014-09          
Assets          
Accounts receivable, less allowance for doubtful accounts       124,505  
Other current assets       6,622  
Deferred tax assets, net       44,887  
Other assets       11,010  
Liabilities          
Current portion of deferred revenue       116,622  
Stockholders’ equity:          
Accumulated deficit       $ (75,046)  
Balances without adoption of ASU 2014-09 | Adjustments due to ASU 2014-09          
Assets          
Accounts receivable, less allowance for doubtful accounts 109,266        
Other current assets 6,201        
Other assets 14,114        
Effect of Change on Net Income Higher/(Lower) | Adjustments due to ASU 2014-09          
Assets          
Accounts receivable, less allowance for doubtful accounts (8,261)   (7,925)    
Other current assets 3,637   2,771    
Deferred tax assets, net     (780)    
Other assets $ 5,419   4,459    
Liabilities          
Current portion of deferred revenue     (3,696)    
Stockholders’ equity:          
Accumulated deficit     $ 2,221