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
Income Statement [Abstract]
Net revenues	$ 140,383		$ 130,570		$ 427,909		$ 392,240
Operating expenses
Cost of revenues (exclusive of depreciation and amortization shown separately below)	57,965		56,203		176,508		168,566
Selling and marketing	36,813		33,379		112,242		101,924
General and administrative (exclusive of expenses shown separately below)	17,810		15,605		54,815		47,284
Research and development	5,534		4,145		14,655		11,699
Excise and sales tax expense	0		1		0		78
Depreciation	8,697		8,459		26,248		25,029
Amortization	2,582		855		7,549		1,709
Restructuring costs	68		240		68		441
Asset impairments	4,938		18		4,938		216
Net legal settlements and related expenses	172		278		172		591
Acquisition-related costs	2,147		2,805		5,838		3,044
Total operating expenses	136,726		121,988		403,033		360,581
Operating income	3,657		8,582		24,876		31,659
Other (expense) income
Interest expense	(2,133)		(1,599)		(6,618)		(4,927)
Interest income	5		22		25		93
Other, net	741		(88)		996		130
Total other expense, net	(1,387)		(1,665)		(5,597)		(4,704)
Income from continuing operations before income taxes	2,270		6,917		19,279		26,955
Income tax (benefit) expense	(376)		2,072		5,230		6,821
Net income from continuing operations	2,646		4,845		14,049		20,134
Loss from discontinued operations, net of taxes	(100)		(182)		(283)		(418)
Net income	$ 2,546		$ 4,663		$ 13,766		$ 19,716
BASIC WEIGHTED-AVERAGE SHARES OUTSTANDING	45,162		46,313		45,797		46,202
Basic net income (loss) per share
Continuing operations	$ 0.06	[1]	$ 0.10	[1]	$ 0.31	[1]	$ 0.44	[1]
Discontinued operations	$ 0.00	[1]	$ 0.00	[1]	$ (0.01)	[1]	$ (0.01)	[1]
Net income per share	$ 0.06	[1]	$ 0.10	[1]	$ 0.30	[1]	$ 0.43	[1]
DILUTED WEIGHTED-AVERAGE SHARES OUTSTANDING	45,898		46,818		46,485		46,685
Diluted net income (loss) per share
Continuing operations	$ 0.06	[1]	$ 0.10	[1]	$ 0.30	[1]	$ 0.43	[1]
Discontinued operations	$ 0.00	[1]	$ 0.00	[1]	$ (0.01)	[1]	$ (0.01)	[1]
Net income per share	$ 0.06	[1]	$ 0.10	[1]	$ 0.30	[1]	$ 0.42	[1]

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