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Geographic Information (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Geographic revenue based on customer location and long-lived tangible assets          
Revenue $ 161,741 $ 156,584 $ 325,073 $ 309,603  
Total long-lived tangible assets 68,350   68,350   $ 76,188
North America          
Geographic revenue based on customer location and long-lived tangible assets          
Revenue 57,657 $ 56,056 115,171 $ 113,014  
Total long-lived tangible assets $ 62,841   $ 62,841   $ 71,758
United States | Revenue benchmark | Geographic concentration          
Geographic revenue based on customer location and long-lived tangible assets          
Concentration risk percentage 32.00% 33.00% 32.00% 33.00%  
United States | Total long-lived tangible assets | Geographic concentration          
Geographic revenue based on customer location and long-lived tangible assets          
Concentration risk percentage     84.00%   88.00%
Europe          
Geographic revenue based on customer location and long-lived tangible assets          
Revenue $ 53,647 $ 53,291 $ 109,132 $ 105,225  
Total long-lived tangible assets 5,446   5,446   $ 4,371
Rest of the world          
Geographic revenue based on customer location and long-lived tangible assets          
Revenue 50,437 $ 47,237 100,770 $ 91,364  
Total long-lived tangible assets $ 63   $ 63   $ 59