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Revenue (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Disaggregation of Revenue [Line Items]        
Revenues $ 306,289 $ 302,452 $ 612,697 $ 601,740
US [Member]        
Disaggregation of Revenue [Line Items]        
Revenues 191,848 187,818 384,003 373,001
EMEA [Member]        
Disaggregation of Revenue [Line Items]        
Revenues 51,595 53,367 103,741 106,784
China [Member]        
Disaggregation of Revenue [Line Items]        
Revenues 29,448 26,550 57,690 52,408
Other [Member]        
Disaggregation of Revenue [Line Items]        
Revenues $ 33,398 $ 34,717 $ 67,263 $ 69,547