Schedule II VALUATION AND QUALIFYING ACCOUNTS (Details) (USD $)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Allowance for doubtful accounts receivable
Changes in valuation and qualifying accounts
Balance at Beginning of Year	$ 11,847,000	$ 11,930,000	$ 14,996,000
Charged (Credited) to Expense	(14,000)	(76,000)	(3,066,000)
Deductions - Write-offs		(7,000)
Balance at End of Year	11,833,000	11,847,000	11,930,000
Allowance for deferred tax assets
Changes in valuation and qualifying accounts
Balance at Beginning of Year	85,755,000	197,407,000	422,555,000
Charged (Credited) to Expense	(47,013,000)	(111,652,000)	(225,148,000)
Balance at End of Year	38,742,000	85,755,000	197,407,000
Tax benefit related to release of valuation allowances	$ 116,700,000