Earnings Per Share (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Basic EPS
Net loss available to common stockholders	$ 3,975	$ 12,464
Net Income available to common stockholders, Shares	89,591,000	89,288,000
Net Income available to common stockholders, Per-Share	$ 0.04	$ 0.14
Effect of Dilutive Securities
Equity awards, Income	0	0
Equity awards, Shares	230,000	365,000
Diluted EPS
Net loss available to common stockholders	$ 3,975	$ 12,464
Net income available to common stockholders, shares	89,821,000	89,653,000
Net Income available to common stockholders, Per-Share	$ 0.04	$ 0.14
Stock Options [Member]
Earnings Per Share (Textual) [Abstract]
Number of shares of common stock equivalents related to convertible debt	1,167	1,394,136
Convertible Senior Notes Due March 2028 [Member]
Earnings Per Share (Textual) [Abstract]
Debt Instrument, Interest Rate, Stated Percentage	3.25%