Quarterly report pursuant to Section 13 or 15(d)

Accounting Policies - ASC 606, Revenue Recognition (Details)

v3.8.0.1
Accounting Policies - ASC 606, Revenue Recognition (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Dec. 31, 2017
Revenue Recognition    
Customer contract period 90 days  
Receivables, net    
Contract Assets    
Receivables, unbilled $ 38,533 $ 37,142
Accrued liabilities    
Contract Liabilities    
Deferred revenue $ 8,801 $ 9,275