CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended				6 Months Ended
	Jun. 30, 2014		Jun. 30, 2013		Jun. 30, 2014		Jun. 30, 2013
Income Statement [Abstract]
Net revenues	$ 144,287		$ 132,178		$ 287,526		$ 261,670
Operating expenses
Cost of revenues (exclusive of depreciation and amortization shown separately below)	59,001		56,856		118,543		112,363
Selling and marketing	37,593		34,382		75,429		68,545
General and administrative (exclusive of expenses shown separately below)	19,070		16,186		37,005		31,679
Research and development	4,616		3,831		9,121		7,554
Excise and sales tax expense	0		77		0		77
Depreciation	8,885		8,331		17,551		16,570
Amortization	2,484		392		4,967		854
Restructuring costs	0		131		0		201
Asset impairments	0		54		0		198
Net legal settlements and related expenses	0		220		0		313
Acquisition-related costs	1,786		212		3,691		239
Total operating expenses	133,435		120,672		266,307		238,593
Operating income	10,852		11,506		21,219		23,077
Other (expense) income
Interest expense	(2,385)		(1,527)		(4,485)		(3,328)
Interest income	11		50		20		71
Other, net	(36)		188		255		218
Total other expense, net	(2,410)		(1,289)		(4,210)		(3,039)
Income from continuing operations before income taxes	8,442		10,217		17,009		20,038
Income tax expense	2,309		2,109		5,606		4,749
Net income from continuing operations	6,133		8,108		11,403		15,289
Loss from discontinued operations, net of taxes	(118)		(133)		(183)		(236)
Net income	$ 6,015		$ 7,975		$ 11,220		$ 15,053
BASIC WEIGHTED-AVERAGE SHARES OUTSTANDING	45,859		46,204		46,121		46,146
Basic net income per share
Continuing operations	$ 0.13	[1]	$ 0.18	[1]	$ 0.25	[1]	$ 0.33	[1]
Discontinued operations	$ 0.00	[1]	$ 0.00	[1]	$ 0.00	[1]	$ (0.01)	[1]
Net income per share	$ 0.13	[1]	$ 0.17	[1]	$ 0.24	[1]	$ 0.33	[1]
DILUTED WEIGHTED-AVERAGE SHARES OUTSTANDING	46,550		46,720		46,784		46,618
Diluted net income per share
Continuing operations	$ 0.13		$ 0.17		$ 0.24		$ 0.33
Discontinued operations	$ 0.00		$ 0.00		$ 0.00		$ (0.01)
Net income per share	$ 0.13		$ 0.17		$ 0.24		$ 0.32

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