CONSOLIDATED STATEMENTS OF EQUITY (USD $) In Thousands, except Share data	Total		Common Stock	Capital In Excess of Par Value	Retained Earnings	Treasury Stock	Accumulated Other Comprehensive Income(Loss)	Stockholders' Equity	Non-Controlling Interests
Beginning Balance at Dec. 31, 2011	$ 1,733,712		$ 242,416	$ 1,375,976	$ 239,103	$ (95,827)	$ (102,030)	$ 1,659,638	$ 74,074
Beginning Balance (in shares) at Dec. 31, 2011			242,416,424
Net income	65,424				62,758			62,758	2,666
Other comprehensive income, net of tax	2,262	[1]					2,109	2,109	153
Exercise of stock options (in shares)			129,998
Exercise of stock options	552		130	422				552
Share vesting (in shares)			538,676
Share vesting			539	(539)
Purchase of treasury shares	(2,184)					(2,184)		(2,184)
Stock-based compensation charges	3,294			3,294				3,294
Distributions to noncontrolling interests	(15,733)								(15,733)
Ending Balance at Mar. 31, 2012	1,787,327		243,085	1,379,153	301,861	(98,011)	(99,921)	1,726,167	61,160
Ending Balance (in shares) at Mar. 31, 2012			243,085,098
Beginning Balance at Dec. 31, 2012	1,952,105		243,442	1,391,271	445,756	(98,725)	(94,413)	1,887,331	64,774
Beginning Balance (in shares) at Dec. 31, 2012			243,442,156
Net income	24,318				20,553			20,553	3,765
Other comprehensive income, net of tax	(6,296)	[1]					(6,284)	(6,284)	(12)
Exercise of stock options (in shares)			18,549
Exercise of stock options	72		18	54				72
Share vesting (in shares)			317,664
Share vesting			318	(318)
Purchase of treasury shares	(1,034)					(1,034)		(1,034)
Stock-based compensation charges	3,923			3,852		71		3,923
Distributions to noncontrolling interests	(6,200)								(6,200)
Ending Balance at Mar. 31, 2013	$ 1,966,888		$ 243,778	$ 1,394,859	$ 466,309	$ (99,688)	$ (100,697)	$ 1,904,561	$ 62,327
Ending Balance (in shares) at Mar. 31, 2013			243,778,369

[1] The tax impacts on amounts presented in other comprehensive income are not significant.