Treasury Stock (Details) (USD $)	3 Months Ended	9 Months Ended			1 Months Ended
	Sep. 30, 2011	Sep. 30, 2011	Sep. 30, 2010	Dec. 31, 2010	Sep. 30, 2011 Stock Repurchase Program [Member]	Aug. 30, 2011 Stock Repurchase Program [Member]
Equity, Class of Treasury Stock [Line Items]
Stock Repurchase Program, Authorized Amount						$ 150,000,000
Treasury Stock, Shares, Acquired					10,900,000
Treasury Stock, Value, Acquired, Cost Method		793,000	274,000		48,700,000
Share Repurchase Program Commission Incurred					200,000
Treasury Stock Acquired, Average Cost Per Share					$ 4.47
Stock Repurchase Program, Remaining Authorized Repurchase Amount					101,300,000
Other Accrued Liabilities, Current	52,222,000	52,222,000		45,842,000	7,400,000
Shares Paid for Tax Withholding for Share Based Compensation	3,000	54,000
Adjustments Related to Tax Withholding for Share-based Compensation		$ 400,000