CONSOLIDATED STATEMENTS OF OPERATIONS (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS [Abstract]
Net revenues	$ 505,281	$ 473,834	$ 441,753
Operating expenses
Cost of revenues (exclusive of depreciation and amortization shown separately below)	215,154	195,822	178,699
Selling and marketing	130,631	134,018	122,034
General and administrative (exclusive of expenses shown separately below)	63,412	57,176	58,576
Research and development	14,349	11,521	14,136
Excise and sales tax expense	321	352	439
Depreciation	32,482	30,831	25,980
Amortization	3,981	6,365	7,386
Restructuring costs	612	847	12,257
Asset impairments	879	456	290
Net legal settlements and related expenses	2,034	490	975
Total operating expenses	463,855	437,878	420,772
Operating income	41,426	35,956	20,981
Other (expense) income
Interest expense	(7,167)	(9,954)	(10,785)
Unrealized gain on change in fair value of interest rate swaps			1,228
Interest income	49	46	157
Other, net	(808)	(574)	(1,075)
Total other expense	(7,926)	(10,482)	(10,475)
Income from continuing operations before income taxes	33,500	25,474	10,506
Income tax expense	5,445	8,586	1,540
Net income from continuing operations	28,055	16,888	8,966
(Loss) income from discontinued operations, net of taxes	(465)	4,546	(4,135)
Net income	$ 27,590	$ 21,434	$ 4,831
BASIC WEIGHTED-AVERAGE SHARES OUTSTANDING	47,596	49,619	58,009
Basic net income (loss) per share
Continuing operations	$ 0.59	$ 0.34	$ 0.15
Discontinued operations	$ (0.01)	$ 0.09	$ (0.07)
Net income per share	$ 0.58	$ 0.43	$ 0.08
DILUTED WEIGHTED-AVERAGE SHARES OUTSTANDING	48,092	49,971	58,355
Diluted net income (loss) per share
Continuing operations	$ 0.58	$ 0.34	$ 0.15
Discontinued operations	$ (0.01)	$ 0.09	$ (0.07)
Net income per share	$ 0.57	$ 0.43	$ 0.08