EARNINGS PER SHARE (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2011	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, 2010	Dec. 31, 2009
Earnings Per Share Basic And Diluted [Line Items]
Net Income Attributable to Controlling Interests	$ 113,200	$ 90,000	$ 77,300	$ 114,200	$ 129,300	$ 100,500	$ 71,900	$ 86,200	$ 394,693	$ 387,949	$ 330,033
Basic									177,410,167	176,636,086	172,567,928
Weighted Average Number Diluted Shares Outstanding Adjustment									394,401	249,301	149,318
Diluted									177,804,568	176,885,387	172,717,246
Earnings Per Share Basic And Diluted	$ 0.64	$ 0.51	$ 0.44	$ 0.64	$ 0.73	$ 0.57	$ 0.41	$ 0.49
Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount									4,314	1,578	17,637
Basic Earnings Per Common Share									$ 2.22	$ 2.20	$ 1.91
Diluted Earnings Per Common Share									$ 2.22	$ 2.19	$ 1.91