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Revenue Recognition (Revenue by Geographic Region) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Disaggregation of Revenue [Line Items]    
Anti-dilutive common stock awards not included in earnings per share calculation (in shares) 8,330,741 10,074,809
Revenue $ 66,402 $ 58,241
United States    
Disaggregation of Revenue [Line Items]    
Revenue 38,589 34,071
Other Americas    
Disaggregation of Revenue [Line Items]    
Revenue [1] 2,769 1,259
Total Americas    
Disaggregation of Revenue [Line Items]    
Revenue 41,358 35,330
EMEA    
Disaggregation of Revenue [Line Items]    
Revenue [2],[3] 18,113 16,919
APAC    
Disaggregation of Revenue [Line Items]    
Revenue [4] 6,931 5,992
United Kingdom    
Disaggregation of Revenue [Line Items]    
Revenue 11,700 11,700
Netherlands    
Disaggregation of Revenue [Line Items]    
Revenue $ 2,500 $ 1,900
[1] Canada, Latin America and South America
[2] Europe, the Middle East and Africa (“EMEA”)
[3] Includes revenues from the United Kingdom of $11.7 million for the three months ended March 31, 2019 and 2018, respectively, and from the Netherlands of $2.5 million and $1.9 million for the three months ended March 31, 2019 and 2018, respectively.
[4] Asia-Pacific (“APAC”)