CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Revenues:
Products	$ 94,052	$ 88,633	$ 379,498	$ 370,980
Services	31,048	29,894	103,549	102,109
Total revenues	125,100	118,527	483,047	473,089
Operating expenses:
Cost of revenues-products	71,097	67,667	290,049	283,427
Cost of revenues-services	4,983	4,802	15,343	14,519
Sales and marketing	22,650	21,184	82,596	79,194
General and administrative	19,737	16,709	52,674	45,823
Amortization of intangible assets	2,777	5,721	11,618	18,524
Restructuring and other exit costs	(67)		220
Total operating expenses	121,177	116,083	452,500	441,487
Operating income	3,923	2,444	30,547	31,602
Interest income	144	153	442	496
Interest expense	(1,557)	(4,067)	(4,336)	(10,450)
Other (expense) income, net	(74)	25	398	265
Income (loss) before income taxes	2,436	(1,445)	27,051	21,913
Provision (benefit) for income taxes	(2,178)	(1,625)	8,108	6,958
Net income	$ 4,614	$ 180	$ 18,943	$ 14,955
Earnings per common share:
Basic earnings per share (in dollars per share)	$ 0.24	$ 0.01	$ 0.98	$ 0.80
Diluted earnings per share (in dollars per share)	$ 0.24	$ 0.01	$ 0.98	$ 0.80