Unaudited Consolidated Statements of Operations (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Income Statement [Abstract]
Revenue	$ 82,373us-gaap_Revenues	$ 102,575us-gaap_Revenues
Cost of revenue	55,846us-gaap_CostOfRevenue	58,894us-gaap_CostOfRevenue
Gross margin	26,527us-gaap_GrossProfit	43,681us-gaap_GrossProfit
Expenses:
Selling, general and administrative	23,888	21,572
Depreciation and amortization	2,676us-gaap_DepreciationAndAmortization	2,285us-gaap_DepreciationAndAmortization
Research and development	1,252us-gaap_ResearchAndDevelopmentExpense	1,026us-gaap_ResearchAndDevelopmentExpense
Total expenses	27,816us-gaap_OperatingExpenses	24,883us-gaap_OperatingExpenses
Income (loss) from operations	(1,289)us-gaap_OperatingIncomeLoss	18,798us-gaap_OperatingIncomeLoss
Other income (expense):
Interest expense	(407)us-gaap_InterestExpense	(454)us-gaap_InterestExpense
Other income (expense), net	(225)us-gaap_OtherNonoperatingIncomeExpense	54us-gaap_OtherNonoperatingIncomeExpense
Total other income (expense)	(632)us-gaap_NonoperatingIncomeExpense	(400)us-gaap_NonoperatingIncomeExpense
Income (loss) before income taxes	(1,921)	18,398
Income tax benefit (expense)	406us-gaap_IncomeTaxExpenseBenefit	(6,380)us-gaap_IncomeTaxExpenseBenefit
Net income (loss)	$ (1,515)us-gaap_NetIncomeLoss	$ 12,018us-gaap_NetIncomeLoss
Earnings (loss) per common share:
Basic earnings (loss) per common share (in dollars per share)	$ (0.03)us-gaap_EarningsPerShareBasic	$ 0.22us-gaap_EarningsPerShareBasic
Diluted earnings (loss) per common share (in dollars per share)	$ (0.03)us-gaap_EarningsPerShareDiluted	$ 0.22us-gaap_EarningsPerShareDiluted
Weighted average common shares:
Weighted average common shares used in computing basic earnings (loss) per common share (in shares)	54,448	53,948
Weighted average common shares used in computing diluted earnings (loss) per common share (in shares)	54,448	55,398

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