Income Taxes (Schedule Of Deferred Tax Assets And Liabilities) (Details) (USD $) In Thousands	Jun. 30, 2011	Dec. 31, 2010
Income Taxes
Federal net operating loss carryforward	$ 98,854	$ 73,189
State net operating loss carryforward	49,485	47,041
Asset impairment charges	38,307	46,118
Warranty, litigation and other reserves	24,641	27,635
Stock-based compensation expense	25,124	22,777
Alternative minimum tax and other tax credit carryforwards	10,296	10,296
Accrued liabilities	10,529	9,789
Inventory, additional costs capitalized for tax purposes	5,368	5,368
Property, equipment and other assets, net	1,761	1,773
Charitable contribution on carryforward	946	938
Deferred revenue	293	326
Total deferred tax assets	265,604	245,250
Valuation allowance	(252,209)	(231,379)
Total deferred tax assets, net of valuation allowance	13,395	13,871
Deferred revenue	5,731	6,401
Unrealized gain	2,393	1,880
Accrued liabilities	383	713
Inventory, additional costs capitalized for financial statement purposes	580	604
Other, net	4,308	4,273
Total deferred tax liabilities	13,395	13,871
Net deferred tax asset

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Deferred Tax Liabilities Tax Accrued Liabilities

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The tax effect as of the balance sheet date of the amount of the estimated future tax deductions attributable to income recognized only for tax purposes and which will reverse when recognized under generally accepted accounting principles.

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The sum of the tax effects as of the balance sheet date of the amounts of all future tax deductions arising from temporary differences between tax basis and generally accepted accounting principles basis recognition of assets, liabilities, revenues and expenses, which can only be deducted for tax purposes when permitted under enacted tax laws ( before the valuation allowance, if any, to reduce such sum amount to net realizable value). Includes any tax benefit realized in deferred tax assets for significant impacts of tax planning strategies.

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The tax effect as of the balance sheet date of the amount of the estimated future tax deductions attributable to inventory related items which can only be realized if sufficient taxable income is generated in future periods to enable the deduction to be taken.

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For entities that net deferred tax assets and tax liabilities, represents the unclassified net amount of deferred tax assets and liabilities as of the balance sheet date, which result from applying the applicable enacted tax rate to net temporary differences and carryforwards pertaining to assets or liabilities. A temporary difference is a difference between the tax basis of an asset or liability and its carrying amount in the financial statements prepared in accordance with generally accepted accounting principles that will reverse in ensuing periods.

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The aggregate tax effects as of the balance sheet date of all future tax deductions arising from temporary differences between tax basis and generally accepted accounting principles basis recognition of assets, liabilities, revenues and expenses, which can only be deducted for tax purposes when permitted under enacted tax laws; net of deducting the allocated valuation allowance, if any, to reduce such amount to net realizable value.

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The tax effect as of the balance sheet date of the amount of excess of tax deductions over gross income in a year which cannot be used on the tax return of the country of domicile in the current year but can be carried forward to reduce taxable income or income taxes payable in a future year, for which there must be sufficient tax-basis income to utilize a portion or all of the carryforward amount to realize the deferred tax asset.

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The tax effect as of the balance sheet date of the amount of excess of tax deductions over gross income in a year which cannot be used on the tax return of a state or local jurisdiction in the current year but can be carried forward to reduce taxable income or income taxes payable in a future year, for which there must be sufficient tax-basis income to utilize a portion or all of the carryforward amount to realize the deferred tax asset.

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The tax effect as of the balance sheet date of the amount of estimated future tax deductions arising from other temporary differences not otherwise specified in the taxonomy.

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The tax effect as of the balance sheet date of the amount of future tax deductions arising from unused alternative minimum tax credit carryforwards; a tax credit carryforward is the amount by which tax credits available for utilization exceeded statutory limits on inclusion in historical filings, and which can only be utilized if sufficient tax-basis income is generated in future periods and providing tax laws continue to allow such utilization.

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The tax effect as of the balance sheet date of the amount of the estimated future tax deductions arising from share-based compensation costs, which can only be deducted for tax purposes when actual costs are incurred, and which can only be realized if sufficient tax-basis income is generated in future periods to enable the deduction to be taken.

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The tax effect as of the balance sheet date of the amount of the estimated future tax deductions arising from currently nondeductible expenses in accrued liabilities, which can only be deducted for tax purposes when such items are actually incurred, and which can only be realized if sufficient tax-basis income is generated in future periods to enable the deduction to be taken.

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The tax effect as of the balance sheet date of the amount of the amount of the estimated future tax deductions arising from estimated impairment losses, which can only be deducted for tax purposes when impaired assets are sold or otherwise disposed of, and which can only be realized if sufficient tax-basis income is generated in future periods to enable the deduction to be taken.

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The tax effect as of the balance sheet date of the amount of the estimated future tax deductions arising from estimated warranty reserves, which can only be deducted for tax purposes when warranty losses are actually incurred, and which can only be realized if sufficient tax-basis income is generated in future periods to enable the deduction to be taken.

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The cumulative amount of all deferred tax liabilities, which result from applying the applicable tax rate to net taxable temporary differences pertaining to each jurisdiction to which the entity is obligated to pay income tax. A taxable temporary difference is a difference between the tax basis and the carrying amount of an asset or liability in the financial statements prepared in accordance with generally accepted accounting principles that will result in taxable amounts in one or more future periods.

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The amount as of the balance sheet date of the estimated future tax effects attributable to inventory-related costs expensed for tax purposes but capitalized in conformity with generally accepted accounting principles, which will reverse in future periods when inventory is sold but such capitalized costs cannot be deducted for tax purposes.

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The cumulative amount of the estimated future tax effects attributable to other temporary differences not otherwise specified in this taxonomy that were expensed for tax purposes but capitalized in conformity with generally accepted accounting principles, or which were recognized as revenue under GAAP but not for tax purposes, which will reverse in future periods.

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The amount as of the balance sheet date of the estimated future tax effects arising from revenue or other income not otherwise listed in the existing taxonomy that is included in accounting income in conformity with generally accepted accounting principles but excluded from tax-basis income, which will increase future taxable income when such income is recognized for tax purposes.

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The amount as of the balance sheet date of the estimated future tax effects arising from unrealized gains on investments in debt and equity securities categorized as trading which will increase future taxable income when such gain is realized. This item excludes deferred tax liabilities generated due to unrealized holding gains on investments in debt and equity securities categorized as available for sale which unrealized holding gains are included in the item Deferred Tax Liabilities, Other Comprehensive Income; such unrealized holding gains increase the carrying value of the asset recorded for financial reporting purposes, but not for tax purposes.

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The amount of the valuation allowance recorded as of the balance sheet date pertaining to the specified deferred tax asset for which an assessment was made that it is more likely than not that all or a portion of such deferred tax asset will not be realized through related deductions on future tax returns.

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