Condensed Consolidated Statements Of Income (USD $) In Thousands, except Share data	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Condensed Consolidated Statements Of Income
Revenue	$ 31,066	$ 24,435	$ 60,795	$ 48,896
Costs and expenses:
Cost of revenue	2,961	1,910	4,987	3,728
Cost of revenue-amortization of acquired technology	798	868	1,575	1,739
Total cost of revenue	3,759	2,778	6,562	5,467
Gross profit	27,307	21,657	54,233	43,429
Operating expenses:
Marketing and selling	8,231	6,204	16,029	12,178
Research and development	3,933	3,570	8,060	7,591
General and administrative	4,144	4,072	8,337	8,096
Amortization of other intangible assets	1,304	1,187	2,595	2,388
Total operating expenses	17,612	15,033	35,021	30,253
Income from operations	9,695	6,624	19,212	13,176
Other (income) expense:
Interest expense	885	1,108	1,801	2,303
Interest income	(25)		(62)	(13)
(Gain) loss on foreign exchange	(85)	1,701	(481)	2,689
Loss (gain) on derivatives	351	(1,008)	1,023	(1,765)
Other (income) expense, net		(9)		(9)
Total other expense	1,126	1,792	2,281	3,205
Income before provision for income taxes	8,569	4,832	16,931	9,971
Provision for income taxes	2,971	1,788	5,893	3,665
Net income	5,598	3,044	11,038	6,306
Net income available to common stockholders - basic & diluted	$ 5,502	$ 3,022	$ 10,861	$ 6,266
Net income per common share:
Basic	$ 0.16	$ 0.09	$ 0.31	$ 0.18
Diluted	$ 0.15	$ 0.08	$ 0.30	$ 0.17
Weighted average number of shares:
Basic	35,308,941	34,727,219	35,176,156	34,651,885
Diluted	36,772,515	35,992,541	36,638,697	35,924,077