Income Taxes (Schedule Of Deferred Tax Assets And Liabilities) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Income Taxes [Abstract]
Federal net operating loss carryforward	$ 133,454	$ 73,189
State net operating loss carryforward	53,350	47,041
Asset impairment charges	31,137	46,118
Stock-based compensation expense	26,771	22,777
Warranty, litigation and other reserves	18,933	27,635
Accrued liabilities	10,667	9,789
Alternative minimum tax and other tax credit carryforwards	10,296	10,296
Inventory, additional costs capitalized for tax purposes	3,466	5,368
Unrealized loss on marketable securities	2,787
Charitable contribution on carryforward	942	938
Deferred revenue	580	326
Property, equipment and other assets		1,773
Total deferred tax assets	292,383	245,250
Valuation allowance	(281,178)	(231,379)
Total deferred tax assets, net of valuation allowance	11,205	13,871
Deferred revenue	5,589	6,401
Property, equipment and other assets	706
Inventory, additional costs capitalized for financial statement purposes	542	604
Accrued liabilities	32	713
Unrealized gain on marketable securities		1,880
Other, net	4,336	4,273
Total deferred tax liabilities	11,205	13,871
Net deferred tax asset