CONSOLIDATED STATEMENTS OF OPERATIONS (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Statement [Abstract]
Net revenue	$ 567,071us-gaap_SalesRevenueNet	$ 526,865us-gaap_SalesRevenueNet	$ 505,281us-gaap_SalesRevenueNet
Operating expenses
Cost of revenue (exclusive of depreciation and amortization shown separately below)	232,563us-gaap_CostOfRevenue	225,994us-gaap_CostOfRevenue	215,154us-gaap_CostOfRevenue
Selling and marketing	149,198us-gaap_SellingAndMarketingExpense	134,426us-gaap_SellingAndMarketingExpense	130,631us-gaap_SellingAndMarketingExpense
General and administrative (exclusive of expenses shown separately below)	74,244us-gaap_GeneralAndAdministrativeExpense	65,219us-gaap_GeneralAndAdministrativeExpense	63,412us-gaap_GeneralAndAdministrativeExpense
Research and development	20,367us-gaap_ResearchAndDevelopmentExpense	16,574us-gaap_ResearchAndDevelopmentExpense	14,349us-gaap_ResearchAndDevelopmentExpense
Excise and sales tax expense	385us-gaap_ExciseAndSalesTaxes	1,969us-gaap_ExciseAndSalesTaxes	321us-gaap_ExciseAndSalesTaxes
Depreciation	35,226us-gaap_Depreciation	33,758us-gaap_Depreciation	32,482us-gaap_Depreciation
Amortization	11,235us-gaap_AmortizationOfIntangibleAssets	3,496us-gaap_AmortizationOfIntangibleAssets	3,981us-gaap_AmortizationOfIntangibleAssets
Restructuring costs	743us-gaap_RestructuringCharges	3,506us-gaap_RestructuringCharges	612us-gaap_RestructuringCharges
Asset impairments	4,978us-gaap_AssetImpairmentCharges	1,196us-gaap_AssetImpairmentCharges	879us-gaap_AssetImpairmentCharges
Net legal settlements and related expenses	180	598	2,034
Acquisition-related costs	8,162	5,392	0
Total operating expenses	537,281us-gaap_OperatingCostsAndExpenses	492,128us-gaap_OperatingCostsAndExpenses	463,855us-gaap_OperatingCostsAndExpenses
Operating income	29,790us-gaap_OperatingIncomeLoss	34,737us-gaap_OperatingIncomeLoss	41,426us-gaap_OperatingIncomeLoss
Other (expense) income
Interest expense	(9,378)us-gaap_InterestExpense	(7,152)us-gaap_InterestExpense	(7,167)us-gaap_InterestExpense
Interest income	29us-gaap_InvestmentIncomeInterest	117us-gaap_InvestmentIncomeInterest	49us-gaap_InvestmentIncomeInterest
Other, net	1,298us-gaap_OtherNonoperatingIncomeExpense	214us-gaap_OtherNonoperatingIncomeExpense	(808)us-gaap_OtherNonoperatingIncomeExpense
Total other expense	(8,051)us-gaap_NonoperatingIncomeExpense	(6,821)us-gaap_NonoperatingIncomeExpense	(7,926)us-gaap_NonoperatingIncomeExpense
Income from continuing operations before income taxes	21,739	27,916	33,500
Income tax expense	4,296us-gaap_IncomeTaxExpenseBenefit	9,062us-gaap_IncomeTaxExpenseBenefit	5,445us-gaap_IncomeTaxExpenseBenefit
Net income from continuing operations	17,443	18,854	28,055
Loss from discontinued operations, net of taxes	(379)	(538)	(465)
Net income	$ 17,064us-gaap_NetIncomeLoss	$ 18,316us-gaap_NetIncomeLoss	$ 27,590us-gaap_NetIncomeLoss
BASIC WEIGHTED-AVERAGE SHARES OUTSTANDING	45,593	46,214	47,596
Basic net income (loss) per share
Continuing operations	$ 0.38	$ 0.41	$ 0.59
Discontinued operations	$ (0.01)	$ (0.01)	$ (0.01)
Net income per share	$ 0.37us-gaap_EarningsPerShareBasic	$ 0.40us-gaap_EarningsPerShareBasic	$ 0.58us-gaap_EarningsPerShareBasic
DILUTED WEIGHTED-AVERAGE SHARES OUTSTANDING	46,303	46,727	48,092
Diluted net income (loss) per share
Continuing operations	$ 0.38	$ 0.40	$ 0.58
Discontinued operations	$ (0.01)	$ (0.01)	$ (0.01)
Net income per share	$ 0.37us-gaap_EarningsPerShareDiluted	$ 0.39us-gaap_EarningsPerShareDiluted	$ 0.57us-gaap_EarningsPerShareDiluted

Gain (loss) from legal settlements and other, net.

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