UNAUDITED SUPPLEMENTARY DATA (Summary of Selected Quarterly Financial Information (Unaudited)) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020		Dec. 31, 2019		Dec. 31, 2018
UNAUDITED SUPPLEMENTARY DATA [Abstract]
Total revenues	$ 1,175,119	$ 1,309,890	$ 1,322,575	$ 1,049,242	$ 1,186,152	$ 1,418,758	$ 1,327,682	$ 996,511	$ 4,856,826	[1]	$ 4,929,103	[1]	$ 4,382,869	[1]
Gross profit	302,741	380,498	396,519	201,723	293,081	400,643	370,502	191,675	1,281,481		1,255,901		1,100,945
Operating earnings	196,430	288,104	298,896	112,301	193,575	303,376	276,074	104,433	895,731		877,458		747,713
Earnings from continuing operations	115,915	201,125	210,957	59,998	142,595	218,066	197,907	63,935	587,995		622,503		517,841
Net earnings	$ 114,518	$ 199,788	$ 209,916	$ 60,258	$ 141,092	$ 215,713	$ 197,558	$ 63,299	$ 584,480		$ 617,662		$ 515,805
Basic earnings per share from continuing operations	$ 0.87	$ 1.52	$ 1.59	$ 0.45	$ 1.08	$ 1.65	$ 1.50	$ 0.48	$ 4.44		$ 4.71		$ 3.91
Diluted earnings per share from continuing operations	0.87	1.51	1.58	0.45	1.07	1.63	1.48	0.48	4.41		4.67		3.87
Basic net earnings per share	0.86	1.51	1.58	0.45	1.07	1.63	1.49	0.48	4.41		4.67		3.90
Diluted net earnings per share	$ 0.86	$ 1.50	$ 1.58	$ 0.45	$ 1.06	$ 1.62	$ 1.48	$ 0.48	$ 4.39		$ 4.63		$ 3.85

[1] ¹ The geographic markets are defined by states as follows: East market — Arkansas, Delaware, Illinois, Kentucky, Maryland, North Carolina, Pennsylvania, Tennessee, Virginia, and Washington D.C. Gulf Coast market — Alabama, Florida, Georgia, Louisiana, Mexico, Mississippi, Oklahoma, South Carolina and Texas West market — Arizona, California and New Mexico