Schedule II Valuation And Qualifying Accounts (Details) (USD $)	3 Months Ended	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2011		Dec. 31, 2010		Dec. 31, 2009
Valuation and Qualifying Accounts Disclosure [Line Items]
Reversal of valuation allowance based upon change in judgment as to realization				$ 335,300,000
Allowance For Billed Receivables [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Period				3,682,000		923,000
Charged to Costs and Expenses						2,759,000
Deductions From Reserves				(3,459,000)	[1]
Balance at End of Period	223,000	223,000		223,000		3,682,000
Inventory Allowance [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Period		31,370,000		28,297,000		27,200,000
Charged to Costs and Expenses		(10,000)		4,297,000		1,042,000
Charged to Other Accounts						55,000	[2]
Deductions From Reserves				(1,224,000)	[1]
Balance at End of Period	31,360,000	31,360,000		31,370,000		28,297,000
Deferred Tax Valuation Allowance [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Period		11,229,000		414,038,000		487,762,000
Charged to Costs and Expenses		(375,000)		(402,809,000)	[3]	(96,617,000)
Charged to Other Accounts		33,000	[2]			22,893,000	[2]
Balance at End of Period	10,887,000	10,887,000		11,229,000		414,038,000
Reversal of valuation allowance based upon change in judgment as to realization	335,300,000
Valuation Allowance change recorded to continuing operations	$ 67,500,000

[1] Deductions from reserves reflect write-offs of uncollectible billed receivables and disposals of inventory.

[2] The allowance for long-term receivables is recorded as a reduction to revenues. Changes in the deferred tax valuation allowance which have been charged to other accounts have been recorded in accumulated other comprehensive loss and other deferred tax assets.

[3] During the fourth quarter of 2010, we determined, based on all available evidence, that a full valuation allowance was no longer required on our deferred tax assets and, therefore, $335.3 million of the valuation allowance was reversed as an income tax benefit. In addition, the valuation allowance was reduced by $67.5 million recorded as benefit to continuing operations.