CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS [Abstract]
Net revenues	$ 129,492	$ 126,603
Operating expenses
Cost of revenues (exclusive of depreciation and amortization shown separately below)	55,507	53,450
Selling and marketing	34,163	34,034
General and administrative (exclusive of expenses shown separately below)	15,493	15,281
Research and development	3,723	3,379
Depreciation	8,239	7,945
Amortization	462	1,220
Restructuring costs	70	161
Asset impairments	144	25
Net legal settlements and related expenses	120	20
Total operating expenses	117,921	115,515
Operating income	11,571	11,088
Other (expense) income
Interest expense	(1,801)	(1,772)
Interest income	21	4
Other, net	30	(70)
Total other expense	(1,750)	(1,838)
Income from continuing operations before income taxes	9,821	9,250
Income tax expense	2,640	3,024
Net income from continuing operations	7,181	6,226
Loss from discontinued operations, net of taxes	(103)	(47)
Net income	$ 7,078	$ 6,179
BASIC WEIGHTED-AVERAGE SHARES OUTSTANDING	46,087	48,455
Basic net income (loss) per share (1)
Continuing operations	$ 0.16	$ 0.13
Discontinued operations
Net income per share	$ 0.15	$ 0.13
DILUTED WEIGHTED-AVERAGE SHARES OUTSTANDING	46,515	48,929
Diluted net income (loss) per share (1)
Continuing operations	$ 0.15	$ 0.13
Discontinued operations
Net income per share	$ 0.15	$ 0.13