Consolidated Statements of Equity - USD ($) shares in Thousands, $ in Thousands	Total	Cumulative Effect, Period of Adoption, Adjustment	Common Stock	Additional paid-in capital	Retained earnings	Retained earnings Cumulative Effect, Period of Adoption, Adjustment	Accumulated other comprehensive loss	Total shareholders' equity	Total shareholders' equity Cumulative Effect, Period of Adoption, Adjustment	Noncontrolling interest	Noncontrolling interest Cumulative Effect, Period of Adoption, Adjustment
Balance at Dec. 31, 2017	$ 1,994,373	$ (22,462)	$ 1,764	$ 546	$ 2,063,512	$ (22,357)	$ (73,964)	$ 1,991,858	$ (22,357)	$ 2,515	$ (105)
Balance (in shares) at Dec. 31, 2017			176,374
Increase (Decrease) in Equity [Roll Forward]
Shares issued under employee stock plans	179,484		$ 42	179,442				179,484
Shares issued under employee stock plans (in shares)			4,255
Share repurchased under provisions of stock repurchase plan	(647,898)		$ (90)	(234,160)	(413,648)			(647,898)
Share repurchased under provisions of stock repurchase plan (in shares)			(9,047)
Stock compensation expense	56,147			56,147				56,147
Net earnings	619,790				618,199			618,199		1,591
Other comprehensive income (loss)	(32,390)						(31,517)	(31,517)		(873)
Dividends paid	(156,840)			159	(156,999)			(156,840)
Purchase of noncontrolling interest	(688)			(238)				(238)		(450)
Distributions to noncontrolling interest	(1,796)									(1,796)
Balance at Dec. 31, 2018	1,987,720		$ 1,716	1,896	2,088,707		(105,481)	1,986,838		882
Balance (in shares) at Dec. 31, 2018			171,582
Increase (Decrease) in Equity [Roll Forward]
Shares issued under employee stock plans	141,571		$ 34	141,537				141,571
Shares issued under employee stock plans (in shares)			3,377
Share repurchased under provisions of stock repurchase plan	(389,060)		$ (54)	(202,176)	(186,830)			(389,060)
Share repurchased under provisions of stock repurchase plan (in shares)			(5,337)
Stock compensation expense	61,543			61,543				61,543
Net earnings	592,016				590,395			590,395		1,621
Other comprehensive income (loss)	(26,018)						(25,706)	(25,706)		(312)
Dividends paid	(170,553)			403	(170,956)			(170,553)
Balance at Dec. 31, 2019	$ 2,197,219	$ 6,074	$ 1,696	3,203	2,321,316	$ 6,074	(131,187)	2,195,028	$ 6,074	2,191
Balance (in shares) at Dec. 31, 2019	169,622		169,622
Increase (Decrease) in Equity [Roll Forward]
Shares issued under employee stock plans	$ 175,779		$ 43	175,736				175,779
Shares issued under employee stock plans (in shares)			4,272
Share repurchased under provisions of stock repurchase plan	(332,387)		$ (46)	(84,941)	(247,400)			(332,387)
Share repurchased under provisions of stock repurchase plan (in shares)			(4,600)
Stock compensation expense	62,498			62,498				62,498
Net earnings	698,214				696,140			696,140		2,074
Other comprehensive income (loss)	30,759						31,434	31,434		(675)
Dividends paid	(174,929)			1,000	(175,929)			(174,929)
Balance at Dec. 31, 2020	$ 2,663,227		$ 1,693	$ 157,496	$ 2,600,201		$ (99,753)	$ 2,659,637		$ 3,590
Balance (in shares) at Dec. 31, 2020	169,294		169,294