CONSOLIDATED STATEMENTS OF EQUITY - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Loss	Total stockholders' equity	Noncontrolling Interests
Balance value at Dec. 31, 2012	$ 2,351,769	$ 1	$ 2,111,605	$ 387,015	$ (150,556)	$ 2,348,065	$ 3,704
Balance shares at Dec. 31, 2012		107,239
Net income	187,064			186,367		186,367	697
Dividends on common shares	(51,324)			(51,324)		(51,324)
Purchase of Company shares, value	(64,606)		(64,606)			(64,606)
Purchase of Company shares, shares		(2,951)
Shares issued in connection with share-based compensation plans, value	7,938		9,232	(1,294)		7,938
Shares issued in connection with share-based compensation plans, shares		1,612
Share-based compensation expense	22,301		22,301			22,301
Net activity related to noncontrolling interests	(1,908)		(704)			(704)	(1,204)
Other comprehensive income (loss) (Note 18)	5,009				5,012	5,012	(3)
Balance value at Dec. 31, 2013	2,456,243	$ 1	2,077,828	520,764	(145,544)	2,453,049	3,194
Balance shares at Dec. 31, 2013		105,900
Net income	234,215			233,534		233,534	681
Dividends on common shares	(89,939)			(89,939)		(89,939)
Shares issued in connection with share-based compensation plans, value	10,457		12,506	(2,049)		10,457
Shares issued in connection with share-based compensation plans, shares		1,641
Share-based compensation expense	19,302		19,302			19,302
Net activity related to noncontrolling interests	(682)		76			76	(758)
Other comprehensive income (loss) (Note 18)	(53,552)				(53,562)	(53,562)	10
Balance value at Dec. 31, 2014	$ 2,576,044	$ 1	2,109,712	662,310	(199,106)	2,572,917	3,127
Balance shares at Dec. 31, 2014	107,541	107,541
Net income	$ 288,870			288,086		288,086	784
Dividends on common shares	(108,524)			(108,524)		(108,524)
Shares issued in connection with share-based compensation plans, value	14,568		16,769	(2,201)		14,568
Shares issued in connection with share-based compensation plans, shares		1,557
Share-based compensation expense	24,339		24,339			24,339
Net activity related to noncontrolling interests	(741)		(7)			(7)	(734)
Other	7,020			7,020		7,020
Other comprehensive income (loss) (Note 18)	(39,911)				(39,897)	(39,897)	(14)
Balance value at Dec. 31, 2015	$ 2,761,665	$ 1	$ 2,150,813	$ 846,691	$ (239,003)	$ 2,758,502	$ 3,163
Balance shares at Dec. 31, 2015	109,098	109,098