Consolidated Statements Of Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Net sales:
Product	$ 271,683	$ 287,336	$ 807,064	$ 837,824
Software maintenance	28,129	26,365	84,053	73,262
Total net sales	299,812	313,701	891,117	911,086
Cost of sales:
Product	75,144	79,266	225,646	229,529
Software maintenance	2,022	1,683	4,531	4,443
Total cost of sales	77,166	80,949	230,177	233,972
Gross profit	222,646	232,752	660,940	677,114
Operating expenses:
Sales and marketing	114,507	116,736	335,916	348,026
Research and development	52,533	58,972	168,462	170,082
General and administrative	23,255	22,741	69,391	68,854
Total operating expenses	190,295	198,449	573,769	586,962
Operating income	32,351	34,303	87,171	90,152
Other income:
Interest income	396	362	1,089	793
Net foreign exchange gain (loss)	286	(452)	(1,965)	(1,005)
Other income (loss), net	133	(70)	787	283
Income before income taxes	33,166	34,143	87,082	90,223
Provision for (benefit from) income taxes	9,988	(5,559)	23,958	7,275
Net income	$ 23,178	$ 39,702	$ 63,124	$ 82,948
Basic earnings per share	$ 0.18	$ 0.31	$ 0.49	$ 0.65
Weighted average shares outstanding - basic	127,935	127,478	128,219	126,785
Diluted earnings per share	$ 0.18	$ 0.31	$ 0.49	$ 0.65
Weighted average shares outstanding - diluted	128,229	127,903	128,856	127,529
Dividends declared per share	$ 0.19	$ 0.15	$ 0.57	$ 0.45