CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2014		Mar. 31, 2013
Income Statement [Abstract]
Net revenues	$ 143,239		$ 129,492
Operating expenses
Cost of revenues (exclusive of depreciation and amortization shown separately below)	59,542		55,507
Selling and marketing	37,836		34,163
General and administrative (exclusive of expenses shown separately below)	17,935		15,493
Research and development	4,505		3,723
Depreciation	8,666		8,239
Amortization	2,483		462
Restructuring costs	0		70
Asset impairments	0		144
Net legal settlements and related expenses	0		120
Acquisition-related costs	1,905		0
Total operating expenses	132,872		117,921
Operating income	10,367		11,571
Other (expense) income
Interest expense	(2,100)		(1,801)
Interest income	9		21
Other, net	291		30
Total other expense, net	(1,800)		(1,750)
Income from continuing operations before income taxes	8,567		9,821
Income tax expense	3,297		2,640
Net income from continuing operations	5,270		7,181
Loss from discontinued operations, net of taxes	(65)		(103)
Net income	$ 5,205		$ 7,078
BASIC WEIGHTED-AVERAGE SHARES OUTSTANDING	46,385		46,087
Basic net income per share
Continuing operations	$ 0.11	[1]	$ 0.16	[1]
Discontinued operations	$ 0.00	[1]	$ 0.00	[1]
Net income per share	$ 0.11	[1]	$ 0.15	[1]
DILUTED WEIGHTED-AVERAGE SHARES OUTSTANDING	47,020		46,515
Diluted net income per share
Continuing operations	$ 0.11		$ 0.15
Discontinued operations	$ 0.00		$ 0.00
Net income per share	$ 0.11		$ 0.15

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