Revenue Recognition (Tables)

12 Months Ended

Dec. 31, 2018

Segment Reporting Information [Line Items]

Disaggregation of Revenue [Table Text Block]

The following table presents our revenues disaggregated by geography, based on the billing addresses of our customers:

	Year Ended December 31,
	2018		2017		2016
	(In thousands)
U.S	$	756,907	$	707,906	$	667,301
EMEA	212,699		211,349		207,474
China	106,841		106,526		127,298
Other	138,522		139,314		140,094
Total revenues	$	1,214,969	$	1,165,095	$	1,142,167