CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended				9 Months Ended
	Sep. 30, 2013		Sep. 30, 2012		Sep. 30, 2013		Sep. 30, 2012
Income Statement [Abstract]
Net revenues	$ 130,570		$ 125,892		$ 392,240		$ 379,510
Operating expenses
Cost of revenues (exclusive of depreciation and amortization shown separately below)	56,203		53,806		168,566		161,044
Selling and marketing	33,379		31,725		101,924		98,756
General and administrative (exclusive of expenses shown separately below)	15,605		15,855		47,284		47,070
Research and development	4,145		3,703		11,699		10,608
Excise and sales tax expense	1		0		78		118
Depreciation	8,459		8,251		25,029		24,207
Amortization	855		807		1,709		3,239
Restructuring costs	240		590		441		703
Asset impairments	18		696		216		741
Net legal settlements and related expenses	278		1,769		591		1,851
Acquisition-related costs	2,805		0		3,044		0
Total operating expenses	121,988		117,202		360,581		348,337
Operating income	8,582		8,690		31,659		31,173
Other (expense) income
Interest expense	(1,599)		(1,843)		(4,927)		(5,404)
Interest income	22		10		93		19
Other, net	(88)		(282)		130		(531)
Total other expense, net	(1,665)		(2,115)		(4,704)		(5,916)
Income from continuing operations before income taxes	6,917		6,575		26,955		25,257
Income tax expense	2,072		855		6,821		6,618
Net income from continuing operations	4,845		5,720		20,134		18,639
Loss from discontinued operations, net of taxes	(182)		(61)		(418)		(334)
Net income	$ 4,663		$ 5,659		$ 19,716		$ 18,305
BASIC WEIGHTED-AVERAGE SHARES OUTSTANDING	46,313		47,297		46,202		47,949
Basic net income per share
Continuing operations	$ 0.10	[1]	$ 0.12	[1]	$ 0.44	[1]	$ 0.39	[1]
Discontinued operations	$ 0.00	[1]	$ 0.00	[1]	$ (0.01)	[1]	$ (0.01)	[1]
Net income per share	$ 0.10	[1]	$ 0.12	[1]	$ 0.43	[1]	$ 0.38	[1]
DILUTED WEIGHTED-AVERAGE SHARES OUTSTANDING	46,818		47,800		46,685		48,424
Diluted net income per share
Continuing operations	$ 0.10	[1]	$ 0.12	[1]	$ 0.43	[1]	$ 0.38	[1]
Discontinued operations	$ 0.00	[1]	$ 0.00	[1]	$ 0.01	[1]	$ (0.01)	[1]
Net income per share	$ 0.10	[1]	$ 0.12	[1]	$ 0.42	[1]	$ 0.38	[1]

[1] Column totals may not sum due to the effect of rounding on EPS.