CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended				6 Months Ended
	Jun. 30, 2012		Jun. 30, 2011		Jun. 30, 2012		Jun. 30, 2011
CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS [Abstract]
Net revenues	$ 127,015		$ 118,990		$ 253,618		$ 235,915
Operating expenses
Cost of revenues (exclusive of depreciation and amortization shown separately below)	53,788		49,315		107,238		96,657
Selling and marketing	32,997		34,247		67,031		70,359
General and administrative (exclusive of expenses shown separately below)	15,934		14,217		31,215		27,998
Research and development	3,526		2,627		6,905		5,803
Excise and sales tax expense	118				118		21
Depreciation	8,011		7,710		15,956		15,435
Amortization	1,212		1,739		2,432		3,449
Restructuring costs	(48)				113
Asset impairments	20		35		45		54
Net legal settlements and related expenses	62		72		82		72
Total operating expenses	115,620		109,962		231,135		219,848
Operating income	11,395		9,028		22,483		16,067
Other (expense) income
Interest expense	(1,789)		(2,108)		(3,561)		(4,189)
Interest income	5		11		9		26
Other, net	(179)		(167)		(249)		(378)
Total other expense	(1,963)		(2,264)		(3,801)		(4,541)
Income from continuing operations before income taxes	9,432		6,764		18,682		11,526
Income tax expense	2,739		1,911		5,763		3,741
Net income from continuing operations	6,693		4,853		12,919		7,785
(Loss) income from discontinued operations, net of taxes	(226)		36		(273)		5
Net income	$ 6,467		$ 4,889		$ 12,646		$ 7,790
BASIC WEIGHTED-AVERAGE SHARES OUTSTANDING	48,103		50,173		48,279		50,465
Basic net income (loss) per share (1)
Continuing operations	$ 0.14	[1]	$ 0.10	[1]	$ 0.27	[1]	$ 0.15	[1]
Discontinued operations		[1]		[1]	$ (0.01)	[1]		[1]
Net income per share	$ 0.13	[1]	$ 0.10	[1]	$ 0.26	[1]	$ 0.15	[1]
DILUTED WEIGHTED-AVERAGE SHARES OUTSTANDING	48,551		50,508		48,740		50,788
Diluted net income (loss) per share (1)
Continuing operations	$ 0.14	[1]	$ 0.10	[1]	$ 0.27	[1]	$ 0.15	[1]
Discontinued operations		[1]		[1]	$ (0.01)	[1]		[1]
Net income per share	$ 0.13	[1]	$ 0.10	[1]	$ 0.26	[1]	$ 0.15	[1]

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