Summary of Significant Accounting Policies (Details 1) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended							12 Months Ended
	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2010	Sep. 30, 2010	Jun. 30, 2010	Mar. 31, 2010	Dec. 31, 2011	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Basic EPS
Income (loss) from continuing operations	$ 31,060	$ 38,611	$ 12,464	$ (5,078)	$ (23,259)	$ (44,801)	$ (10,046)	$ 29,311	$ 93,499	$ (83,184)	$ (43,002)
Income (loss) from discontinued operations										(8,124)	15,936
NET INCOME (LOSS)	31,060	38,611	12,464	(5,078)	(22,628)	(50,744)	(12,858)	29,311	93,499	(91,308)	(27,066)
Income (loss) from continuing and discontinued operations, Shares									89,383	87,185	71,565
Income (Loss) from continuing operations, Per-Share	$ 0.35	$ 0.43	$ 0.14	$ (0.06)	$ (0.26)	$ (0.51)	$ (0.12)	$ 0.13	$ 1.05	$ (0.95)	$ (0.60)
Income (loss) from discontinued operations, Per-Share	$ 0	$ 0	$ 0		$ 0.01	$ (0.07)	$ (0.04)			$ (0.10)	$ 0.22
Net loss	$ 0.35	$ 0.43	$ 0.14	$ (0.06)	$ (0.25)	$ (0.58)	$ (0.16)	$ 0.13	$ 1.05	$ (1.05)	$ (0.38)
Effect of Dilutive Securities
Equity awards, Income
Equity awards, Shares									342
Equity awards, Per-Share									$ 0.01
Diluted EPS
Income (loss) from continuing operations	31,060	38,611	12,464	(5,078)	(23,259)	(44,801)	(10,046)	29,311	93,499	(83,184)	(43,002)
Income (loss) from discontinued operations, Income										(8,124)	15,936
NET INCOME (LOSS)	$ 31,060	$ 38,611	$ 12,464	$ (5,078)	$ (22,628)	$ (50,744)	$ (12,858)	$ 29,311	$ 93,499	$ (91,308)	$ (27,066)
Income (loss) from continuing and discontinued operations, Shares									89,725	87,185	71,565
Income (loss) from continuing operations, Per-Share	$ 0.35	$ 0.43	$ 0.14	$ (0.06)	$ (0.26)	$ (0.51)	$ (0.12)	$ 0.13	$ 1.04	$ (0.95)	$ (0.60)
Income (loss) from discontinued operations, Per-Share	$ 0	$ 0	$ 0		$ 0.01	$ (0.07)	$ (0.04)			$ (0.10)	$ 0.22
Net loss	$ 0.35	$ 0.43	$ 0.14	$ (0.06)	$ (0.25)	$ (0.58)	$ (0.16)	$ 0.13	$ 1.04	$ (1.05)	$ (0.38)