UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Revenue:
Software license	$ 41,793	$ 68,833	$ 195,220	$ 207,849
Maintenance	62,204	55,038	180,759	163,174
Services	75,818	58,931	225,063	179,633
Total revenue	179,815	182,802	601,042	550,656
Cost of revenue:
Software license	1,276	1,313	3,826	3,646
Maintenance	6,716	6,659	20,945	18,889
Services	61,739	52,465	180,925	154,512
Total cost of revenue	69,731	60,437	205,696	177,047
Gross profit	110,084	122,365	395,346	373,609
Operating expenses:
Selling and marketing	70,209	67,032	217,384	202,126
Research and development	41,031	38,036	121,089	108,530
General and administrative	13,133	11,725	38,174	34,067
Acquisition-related		74		2,903
Total operating expenses	124,373	116,867	376,647	347,626
(Loss)/income from operations	(14,289)	5,498	18,699	25,983
Foreign currency transaction (loss)/gain	(552)	1,082	(793)	2,764
Interest income, net	144	172	470	650
Other income/(expense), net		(1,237)	287	(4,891)
(Loss)/income before (benefit)/provision for income taxes	(14,697)	5,515	18,663	24,506
(Benefit)/provision for income taxes	(12,885)	2,214	(17,952)	6,269
Net (loss)/income	$ (1,812)	$ 3,301	$ 36,615	$ 18,237
(Loss)/earnings per share:
Basic	$ (0.03)	$ 0.04	$ 0.47	$ 0.24
Diluted	$ (0.03)	$ 0.04	$ 0.44	$ 0.23
Weighted-average number of common shares outstanding:
Basic	77,691	76,278	77,258	76,323
Diluted	77,691	79,548	82,717	79,401
Cash dividends declared per share	$ 0.03	$ 0.03	$ 0.09	$ 0.09