CONSOLIDATED STATEMENTS OF EQUITY (USD $) In Thousands, except Share data	Total USD ($)	Common Stock [Member] USD ($)	Exchangeable Shares [Member]	Limited Vote Common Stock [Member]	Series F Preferred Stock [Member]	Additional Paid-in Capital [Member] USD ($)	Retained Earnings [Member] USD ($)	Accumulated Other Comprehensive Income (Loss) [Member] USD ($)	Treasury Stock [Member] USD ($)	Total Stockholders' Equity [Member] USD ($)	Noncontrolling Interest [Member] USD ($)
Balance at Dec. 31, 2009	$ 3,110,561	$ 2				$ 3,065,581	$ 75,836	$ 3,502	$ (35,738)	$ 3,109,183	$ 1,378
Balance, Shares at Dec. 31, 2009		209,378,308		662,293
Other comprehensive income	10,620							10,620		10,620
Acquisitions	83,354					83,354				83,354
Acquisitions, Shares		623,720	3,909,110		1
Exchange of Limited Vote Common Stock for common stock		241,300		(229,808)
Restricted stock activity	18,426					23,048			(4,622)	18,426
Restricted stock activity, shares		845,980
Stock options exercised	534					534				534
Stock options exercised, shares		48,783
Income tax (expenses) benefit from long-term incentive plans	(2,161)					(2,161)				(2,161)
Redemption of convertible subordinated notes	(7,577)					(7,577)				(7,577)
Distributions to noncontrolling interests	(2,395)										(2,395)
Net income	155,557						153,176			153,176	2,381
Balance at Dec. 31, 2010	3,366,919	2				3,162,779	229,012	14,122	(40,360)	3,365,555	1,364
Balance, Shares at Dec. 31, 2010		211,138,091	3,909,110	432,485	1
Other comprehensive income	(13,412)							(13,412)		(13,412)
Acquisitions	32,368					32,368				32,368
Acquisitions, Shares		1,939,813
Exchange of Limited Vote Common Stock for common stock		454,107		(432,485)
Restricted stock activity	15,032					21,618			(6,586)	15,032
Restricted stock activity, shares		729,688
Stock options exercised	867					867				867
Stock options exercised, shares		74,635
Income tax (expenses) benefit from long-term incentive plans	(1,426)					(1,426)				(1,426)
Common stock repurchases	(149,547)								(149,547)	(149,547)
Common stock repurchases, shares		(8,133,329)
Distributions to noncontrolling interests	(5,954)										(5,954)
Net income	144,416						132,515			132,515	11,901
Balance at Dec. 31, 2011	3,389,263	2				3,216,206	361,527	710	(196,493)	3,381,952	7,311
Balance, Shares at Dec. 31, 2011		206,203,005	3,909,110		1
Other comprehensive income	13,743							13,743		13,743
Acquisitions	37,291					37,291				37,291
Acquisitions, Shares		1,927,113
Restricted stock activity	24,845					31,501			(6,656)	24,845
Restricted stock activity, shares		915,816
Stock options exercised	2,385					2,385				2,385
Stock options exercised, shares		224,652
Income tax (expenses) benefit from long-term incentive plans	(297)					(297)				(297)
Distributions to noncontrolling interests	(17,970)										(17,970)
Net income	322,656						306,629			306,629	16,027
Balance at Dec. 31, 2012	$ 3,771,916	$ 2				$ 3,287,086	$ 668,156	$ 14,453	$ (203,149)	$ 3,766,548	$ 5,368
Balance, Shares at Dec. 31, 2012		209,270,586	3,909,110		1