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Revenue (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Disaggregation of Revenue [Line Items]        
Revenues $ 305,777,000 $ 292,428,000 $ 907,517,000 $ 869,594,000
US [Member]        
Disaggregation of Revenue [Line Items]        
Revenues 190,980,000 177,597,000 563,981,000 525,947,000
EMEA [Member]        
Disaggregation of Revenue [Line Items]        
Revenues 53,047,000 52,790,000 159,831,000 158,509,000
China [Member]        
Disaggregation of Revenue [Line Items]        
Revenues 27,094,000 27,177,000 79,502,000 80,680,000
Other [Member]        
Disaggregation of Revenue [Line Items]        
Revenues $ 34,656,000 $ 34,864,000 $ 104,203,000 $ 104,458,000