Consolidated Statements of Equity - USD ($) shares in Thousands, $ in Thousands	Total	Common stock	Additional paid-in capital	Retained earnings	Accumulated other comprehensive income (loss)	Total shareholders' equity	Noncontrolling interest
Balance (in shares) at Dec. 31, 2012		206,392
Balance at Dec. 31, 2012	$ 2,032,570	$ 2,064	$ 1,283	$ 2,018,618	$ 5,734	$ 2,027,699	$ 4,871
Increase (Decrease) in Equity [Roll Forward]
Exercise of stock options and release of restricted shares (in shares)		1,510
Exercise of stock options and release of restricted shares	35,775	$ 15	35,760			35,775
Issuance of shares under stock purchase plan (in shares)		800
Issuance of shares under stock purchase plan	23,977	$ 8	23,969			23,977
Shares repurchased under provisions of stock repurchase plans (in shares)		(6,149)
Shares repurchased under provisions of stock repurchase plans	(261,936)	$ (62)	(105,398)	(156,476)		(261,936)
Stock compensation expense	43,813		43,813			43,813
Tax benefits from stock plans, net	2,174		2,174			2,174
Net earnings	350,011			348,526		348,526	1,485
Other comprehensive loss	(12,420)				(11,999)	(11,999)	(421)
Dividends paid	(123,292)			(123,292)		(123,292)
Purchase of noncontrolling interest	(3,180)		46			46	(3,226)
Distributions of dividends to noncontrolling interest	(1,161)						(1,161)
Balance (in shares) at Dec. 31, 2013		202,553
Balance at Dec. 31, 2013	2,086,331	$ 2,025	1,647	2,087,376	(6,265)	2,084,783	1,548
Increase (Decrease) in Equity [Roll Forward]
Exercise of stock options and release of restricted shares (in shares)		1,529
Exercise of stock options and release of restricted shares	45,469	$ 15	45,454			45,469
Issuance of shares under stock purchase plan (in shares)		672
Issuance of shares under stock purchase plan	23,800	$ 7	23,793			23,800
Shares repurchased under provisions of stock repurchase plans (in shares)		(13,098)
Shares repurchased under provisions of stock repurchase plans	(550,781)	$ (131)	(114,216)	(436,434)		(550,781)
Stock compensation expense	42,533		42,533			42,533
Tax benefits from stock plans, net	1,061		1,061			1,061
Net earnings	379,460			376,888		376,888	2,572
Other comprehensive loss	(31,969)				(31,552)	(31,552)	(417)
Dividends paid	(124,634)			(124,634)		(124,634)
Purchase of noncontrolling interest	841		841			841	0
Distributions of dividends to noncontrolling interest	$ (503)						(503)
Balance (in shares) at Dec. 31, 2014	191,656	191,656
Balance at Dec. 31, 2014	$ 1,871,608	$ 1,916	1,113	1,903,196	(37,817)	1,868,408	3,200
Increase (Decrease) in Equity [Roll Forward]
Exercise of stock options and release of restricted shares (in shares)		2,851
Exercise of stock options and release of restricted shares	105,114	$ 29	105,085			105,114
Issuance of shares under stock purchase plan (in shares)		699
Issuance of shares under stock purchase plan	25,850	$ 7	25,843			25,850
Shares repurchased under provisions of stock repurchase plans (in shares)		(13,139)
Shares repurchased under provisions of stock repurchase plans	(629,991)	$ (131)	(176,493)	(453,367)		(629,991)
Stock compensation expense	43,415		43,415			43,415
Tax benefits from stock plans, net	1,068		1,068			1,068
Net earnings	459,497			457,223		457,223	2,274
Other comprehensive loss	(44,090)				(43,421)	(43,421)	(669)
Dividends paid	(135,673)			(135,673)		(135,673)
Distributions of dividends to noncontrolling interest	$ (2,122)						(2,122)
Balance (in shares) at Dec. 31, 2015	182,067	182,067
Balance at Dec. 31, 2015	$ 1,694,676	$ 1,821	$ 31	$ 1,771,379	$ (81,238)	$ 1,691,993	$ 2,683