CONDENSED CONSOLIDATED STATEMENTS OF INCOME - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Revenue:
Software licenses	$ 126,051	$ 124,969
Maintenance and service	99,855	92,812
Total revenue	225,906	217,781
Cost of sales:
Software licenses	6,738	7,209
Amortization	9,511	9,357
Maintenance and service	19,036	19,322
Total cost of sales	35,285	35,888
Gross profit	190,621	181,893
Operating expenses:
Selling, general and administrative	57,769	56,749
Research and development	44,672	40,009
Amortization	3,158	5,077
Total operating expenses	105,599	101,835
Operating income	85,022	80,058
Interest expense	(86)	(154)
Interest income	950	656
Other (expense) income, net	(108)	767
Income before income tax provision	85,778	81,327
Income tax provision	29,310	25,195
Net income	$ 56,468	$ 56,132
Earnings per share - basic:
Basic earnings per share	$ 0.64	$ 0.62
Weighted average shares - basic	88,114	90,059
Earnings per share - diluted:
Diluted earnings per share	$ 0.63	$ 0.61
Weighted average shares - diluted	90,084	92,140