Consolidated Statement of Total Equity (Unaudited) - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Accumulated Other Comprehensive Loss	Retained Earnings	Total Shareholders' Equity	Noncontrolling Interests
Beginning Balance at Dec. 31, 2016	$ 4,142,590	$ 630	$ 3,334,461	$ (130,687)	$ 935,574	$ 4,139,978	$ 2,612
Beginning Balance (in shares) at Dec. 31, 2016		63,176
Consolidated net earnings	42,307				42,334	42,334	(27)
Other comprehensive earnings, net of tax	2,263			2,262		2,262	1
Dividends declared	(26,560)				(26,560)	(26,560)
Issuances of common stock for stock award plans	5,078	$ 1	5,077			5,078
Issuances of common stock for stock award plans (in shares)		60
Repurchases of common stock	(99,999)	$ (5)			(99,994)	(99,999)
Repurchases of common stock, (in shares)		(458)
Stock-based compensation expense	10,275		10,275			10,275
Ending Balance at Mar. 31, 2017	4,075,954	$ 626	3,349,813	(128,425)	851,354	4,073,368	2,586
Ending Balance (in shares) at Mar. 31, 2017		62,778
Beginning Balance at Dec. 31, 2017	4,682,477	$ 628	3,368,007	(129,104)	1,440,069	4,679,600	2,877
Beginning Balance (in shares) at Dec. 31, 2017		62,873
Consolidated net earnings	10,040				10,023	10,023	17
Other comprehensive earnings, net of tax	1,619			1,619		1,619
Dividends declared	(27,885)				(27,885)	(27,885)
Issuances of common stock for stock award plans	9,893		9,893			9,893
Issuances of common stock for stock award plans (in shares)		75
Shares withheld for employees' income tax obligations	(6,380)		(6,380)			(6,380)
Stock-based compensation expense	9,760		9,760			9,760
Contributions from owners of noncontrolling interest	306						306
Ending Balance at Mar. 31, 2018	$ 4,679,830	$ 628	$ 3,381,280	$ (127,485)	$ 1,422,207	$ 4,676,630	$ 3,200
Ending Balance (in shares) at Mar. 31, 2018		62,948