Income Taxes Schedule of Effective Income Tax Reconciliation (Details)	12 Months Ended
Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Income Tax Disclosure [Abstract]
Tax expense (benefit) at United States statutory rate	35.00%	35.00%	35.00%
State income tax, net of federal effect	1.00%	0.70%	0.90%
Change in valuation allowance due to change in judgment regarding the potential to realize deferred tax assets	0.00%	(64.40%)	0.00%
Change in valuation allowance due to current year change in deferred tax asset balances	0.20%	(32.00%)	(14.20%)
Foreign income tax	(0.50%)	0.10%	(5.80%)
Costa Rican subsidiary tax holiday	(2.00%)	(0.90%)	(9.70%)
Deemed dividend from foreign subsidiary	0.00%	0.00%	1.50%
Stock-based compensation	2.60%	0.40%	7.00%
Business combination	0.00%	0.00%	(1.00%)
Reduction of uncertain tax position liability	(11.20%)	0.00%	0.00%
Tax Credits	(14.80%)	(1.80%)	0.00%
State apportionment adjustment	7.70%	0.00%	0.00%
Other, net	0.40%	(0.90%)	(11.30%)
Effective tax rate	18.40%	(63.80%)	2.40%

Effective Income Tax Rate, Business Combination

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A ratio calculated by dividing the reported amount of income tax expense attributable to continuing operations for the period by GAAP-basis pretax income from continuing operations.

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

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-Section 50

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-Name Regulation S-X (SX)

-Number 210

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The domestic federal statutory tax rate applicable under enacted tax laws to the Company's pretax income from continuing operations for the period. The "statutory" tax rate is the regular tax rate if there are alternative tax systems.

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-Subparagraph (SAB TOPIC 6.I)

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The portion of the difference between the effective income tax rate and domestic federal statutory income tax rate attributable to changes in the valuation allowance for deferred tax assets.

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-Publisher FASB

-Name Accounting Standards Codification

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-Subparagraph (SAB TOPIC 6.I)

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The portion of the difference between the effective income tax rate and domestic federal statutory income tax rate that can be explained by the difference between statutory income tax rates in foreign jurisdictions and the domestic federal statutory income tax rate recorded during the period.

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- Definition

The portion of the difference between the effective income tax rate and domestic federal statutory income tax rate attributable to differences in the deductibility or nondeductibility of incentive stock options and other equity-based compensation costs in accordance with generally accepted accounting principles and enacted tax laws.

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The portion of the difference between the effective income tax rate and domestic federal statutory income tax rate attributable to all other items not otherwise listed in the existing taxonomy.

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The portion of the difference between the effective income tax rate and domestic federal statutory income tax rate attributable to the repatriation of foreign earnings under enacted tax laws.

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The portion of the difference between the effective income tax rate and domestic federal statutory income tax rate that can be explained by the state and local income tax expense or benefit, net of the federal tax benefit (expense) thereon, recorded during the period.

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The sum of the differences between the effective income tax rate and domestic federal statutory income tax rate attributable to changes in all income tax contingencies, whether recorded or adjusted, during the period.

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The sum of the differences between the effective income tax rate and domestic federal statutory income tax rate that can be explained by all tax credits generated or utilized under enacted tax laws during the period.

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The portion of the difference between the effective income tax rate and domestic federal statutory income tax rate attributable to income that is exempt from income tax because of tax holidays an entity has received. A tax "holiday" refers to the tax benefit derived from a jurisdiction that provides an exemption from income taxes for some defined period of time as an incentive to attract business.

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The portion of the difference between the effective income tax rate and domestic federal statutory income tax rate attributable to domestic income tax settlements during the period.

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The portion of the difference between the effective income tax rate and domestic federal statutory income tax rate attributable to state and local income tax settlements during the period.

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