Quarterly report pursuant to Section 13 or 15(d)

Reportable Segments - Revenue by Geographic Region (Details)

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Reportable Segments - Revenue by Geographic Region (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Revenues from External Customers and Long-Lived Assets [Line Items]        
Revenues $ 118,603 $ 109,607 $ 228,278 $ 207,878
United States        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Revenues 52,655 45,387 96,651 77,961
Russia        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Revenues 28,771 36,578 60,062 71,025
EMEA & Asia        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Revenues 22,260 13,537 42,304 28,637
Latin America        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Revenues 4,104 2,753 7,617 5,620
Other CIS        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Revenues 3,506 5,753 7,056 12,061
Other        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Revenues $ 7,307 $ 5,599 $ 14,588 $ 12,574