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Earnings per Share ("EPS"): (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
Numerator
Income from continuing operations	$ 14,905	$ 19,605	$ 63,109	$ 25,131
Income (loss) from discontinued operations	129,638	(40,516)	69,710	(45,951)
Net (income) loss attributable to noncontrolling interests	11,189	(1,695)	13,533	(1,638)
Net income (loss) attributable to the Company	133,354	(19,216)	119,286	(19,182)
Allocation of earnings to participating securities	(115)	(289)	(380)	(831)
Numerator for basic earnings per share-net income (loss) available to common stockholders	133,239	(19,505)	118,906	(20,013)
Numerator for diluted earnings per share-net income (loss) available to common stockholders	$ 133,239	$ (19,505)	$ 118,906	$ (20,013)
Denominator
Denominator for basic earnings per share - weighted average number of common shares outstanding	132,768	131,691	132,520	131,136
Effect of dilutive securities
Stock warrants	68		84
Share and unit-based compensation plans	41		7
Denominator for diluted earnings per share - weighted average number of common shares outstanding	132,877	131,691	132,611	131,136
Earnings per common share-basic:
Income from continuing operations (in dollars per share)	$ 0.10	$ 0.13	$ 0.42	$ 0.17
Discontinued operations (in dollars per share)	$ 0.90	$ (0.28)	$ 0.48	$ (0.32)
Net income (loss) available to common stockholders (in dollars per share)	$ 1.00	$ (0.15)	$ 0.90	$ (0.15)
Earnings per common share-diluted:
Income from continuing operations (in dollars per share)	$ 0.10	$ 0.13	$ 0.42	$ 0.17
Discontinued operations (in dollars per share)	$ 0.90	$ (0.28)	$ 0.48	$ (0.32)
Net income (loss) available to common stockholders (in dollars per share)	$ 1.00	$ (0.15)	$ 0.90	$ (0.15)

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