Condensed Consolidated Statement of Stockholders' Equity (Unaudited) - 3 months ended Mar. 31, 2016 - 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, 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
Net income for three months ended March 31, 2016	$ 52,672			52,501		52,501	171
Dividends on common shares	(28,410)			(28,410)		(28,410)
Purchase of Company shares, value	(454)		(454)			(454)
Purchase of Company shares, shares		(14)
Shares issued in connection with share-based compensation plans, value	(2,144)		(1,480)	(664)		(2,144)
Shares issued in connection with share-based compensation plans, shares		480
Share-based compensation	15,858		15,858			15,858
Net activity related to noncontrolling interests	(744)		(26)			(26)	(718)
Other comprehensive income (Note 12)	47,527				47,481	47,481	46
Balance value at Mar. 31, 2016	$ 2,845,970	$ 1	$ 2,164,711	$ 870,118	$ (191,522)	$ 2,843,308	$ 2,662
Balance shares at Mar. 31, 2016	109,564	109,564