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Earnings per Share (EPS): (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Numerator
Income from continuing operations	$ 46,673	$ 5,179
Loss from discontinued operations	(58,396)	(5,088)
Income attributable to noncontrolling interests	(2,345)	(57)
Net (loss) income attributable to the Company	(14,068)	34
Allocation of earnings to participating securities	(317)	(542)
Numerator for basic earnings per share-net loss available to common stockholders	(14,385)	(508)
Numerator for diluted earnings per share-income loss available to common stockholders	$ (14,385)	$ (508)
Denominator
Denominator for basic earnings per share - weighted average number of common shares outstanding	132,273	130,574
Denominator for diluted earnings per share - weighted average number of common shares outstanding (in shares)	132,273	130,574
Earnings per common share-basic:
Income from continuing operations (in dollars per share)	$ 0.30	$ 0.04
Discontinued operations (in dollars per share)	$ (0.41)	$ (0.04)
Net (loss) income available to common stockholders (in dollars per share)	$ (0.11)
Earnings per common share-diluted:
Income from continuing operations (in dollars per share)	$ 0.30	$ 0.04
Discontinued operations (in dollars per share)	$ (0.41)	$ (0.04)
Net (loss) income available to common stockholders (in dollars per share)	$ (0.11)

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