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Income Taxes (Schedule Of Deferred Tax Assets And Liabilities) (Details) (USD $)
In Thousands
Sep. 30, 2011
Dec. 31, 2010
Income Taxes [Abstract]  
Federal net operating loss carryforward$ 118,716$ 73,189
State net operating loss carryforward51,28647,041
Asset impairment charges35,79446,118
Stock-based compensation expense26,04122,777
Warranty, litigation and other reserves23,30427,635
Accrued liabilities10,4509,789
Alternative minimum tax and other tax credit carryforwards10,29610,296
Unrealized loss on marketable securities5,398 
Inventory, additional costs capitalized for tax purposes3,2645,368
Other1,2283,037
Total deferred tax assets285,777245,250
Valuation allowance(274,380)(231,379)
Total deferred tax assets, net of valuation allowance11,39713,871
Deferred revenue5,5916,401
Unrealized gain 1,880
Accrued liabilities383713
Inventory, additional costs capitalized for financial statement purposes546604
Other, net4,8774,273
Total deferred tax liabilities11,39713,871
Net deferred tax asset