Earnings Per Share (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
A reconciliation between basic and diluted earnings per share computations
Net loss available to common stockholders, Loss	$ (54,520)	$ (3,045)	$ (73,128)	$ (1,148)
Net loss available to common stockholders, Shares	62,363	61,917	62,289	61,793
Attributable to Participating Securities, Diluted Income
Net loss available to common stockholders, Per Share Amount	$ (0.87)	$ (0.05)	$ (1.17)	$ (0.02)
Stock options, Shares
DILUTED EPS, Loss	$ (54,520)	$ (3,045)	$ (73,128)	$ (1,148)
DILUTED EPS, Shares	62,363	61,917	62,289	61,793
DILUTED EPS, Per Share Amount	$ (0.87)	$ (0.05)	$ (1.17)	$ (0.02)