Consolidated Statements 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, 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 ($0.44 per share)	(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
Beginning Balance at Dec. 31, 2018	4,949,412	$ 624	3,396,059	(143,579)	1,693,259	4,946,363	3,049
Beginning Balance (in shares) at Dec. 31, 2018		62,515
Consolidated net earnings	42,826				42,853	42,853	(27)
Other comprehensive earnings, net of tax	3,255			3,255		3,255
Dividends declared ($0.44 per share)	(30,395)				(30,395)	(30,395)
Issuances of common stock for stock award plans	3,974	$ 1	3,973			3,974
Issuances of common stock for stock award plans (in shares)		78
Shares withheld for employees' income tax obligations	(7,128)		(7,128)			(7,128)
Stock-based compensation expense	13,552		13,552			13,552
Ending Balance at Mar. 31, 2019	$ 4,975,496	$ 625	$ 3,406,456	$ (140,324)	$ 1,705,717	$ 4,972,474	$ 3,022
Ending Balance (in shares) at Mar. 31, 2019		62,593