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Revenue (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Disaggregation of Revenue [Line Items]        
Revenues $ 302,452,000 $ 288,552,000 $ 601,740,000 $ 577,166,000
US [Member]        
Disaggregation of Revenue [Line Items]        
Revenues 187,818,000 174,719,000 373,001,000 348,350,000
EMEA [Member]        
Disaggregation of Revenue [Line Items]        
Revenues 53,367,000 52,992,000 106,784,000 105,719,000
China [Member]        
Disaggregation of Revenue [Line Items]        
Revenues 26,550,000 26,050,000 52,408,000 53,503,000
Other [Member]        
Disaggregation of Revenue [Line Items]        
Revenues $ 34,717,000 $ 34,791,000 $ 69,547,000 $ 69,594,000