Revenue Disaggregated Revenue by Geography (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Disaggregation of Revenue [Line Items]
Revenues	$ 318,567	$ 307,471	$ 950,553	$ 950,685
EMEA [Member]
Disaggregation of Revenue [Line Items]
Revenues	32,596	31,474	99,107	96,830
Other foreign countries [Member]
Disaggregation of Revenue [Line Items]
Revenues	48,525	53,398	175,618	156,353
Foreign [Member]
Disaggregation of Revenue [Line Items]
Revenues	81,121	84,872	274,725	253,183
UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues	$ 237,446	$ 222,599	$ 675,828	$ 697,502