Treasury Stock (Details) (USD $)	12 Months Ended								29 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2013 Treasury Stock [Member]	Dec. 31, 2012 Treasury Stock [Member]	Dec. 31, 2011 Treasury Stock [Member]	Dec. 31, 2013 Stock Repurchase Program [Member]	Dec. 31, 2012 Stock Repurchase Program [Member]	Dec. 31, 2013 Stock Repurchase Program [Member]
Equity, Class of Treasury Stock [Line Items]
Authorized amount									$ 300,000,000
Repurchase of common stock, number of shares					16,472,000	28,573,000	0	16,500,000	45,000,000
Treasury Stock, Value, Acquired, Cost Method		79,814,000	129,500,000		79,814,000	129,500,000		79,500,000	208,400,000
Commission incurred								300,000	900,000
Average cost per share (in dollars per share)								$ 4.83
Remaining authorized repurchase amount							91,600,000
Other accrued liabilities, current							0	0	0
Treasury stock acquired through surrender of shares for tax withholding, shares				95,000	109,000	111,000
Adjustments Related to Tax Withholding for Share-based Compensation	$ 466,000	$ 609,000	$ 776,000	$ 466,000	$ 609,000	$ 776,000