Revenue Disaggregation of Revenue by Geography (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Disaggregation of Revenue [Line Items]
Revenues	$ 340,378	$ 327,169	$ 360,460	$ 372,033	$ 370,124	$ 343,236	$ 331,514	$ 247,739	$ 1,400,040	$ 1,292,613	$ 379,372
EMEA [Member]
Disaggregation of Revenue [Line Items]
Revenues									134,363	119,934	50,105
Other foreign countries [Member]
Disaggregation of Revenue [Line Items]
Revenues									210,996	192,640	67,573
Foreign [Member]
Disaggregation of Revenue [Line Items]
Revenues									$ 345,359	$ 312,574	$ 117,678
UNITED STATES
Disaggregation of Revenue [Line Items]
Percent of total revenue									75.00%	76.00%	69.00%
Revenues									$ 1,054,681	$ 980,039	$ 261,694
International Sales [Domain]
Disaggregation of Revenue [Line Items]
Percent of total revenue									25.00%	24.00%	31.00%