UNAUDITED SUPPLEMENTARY DATA (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
UNAUDITED SUPPLEMENTARY DATA [Abstract]
Total revenues	$ 977,490	$ 1,094,715	$ 1,030,763	$ 787,328	$ 872,974	$ 1,008,140	$ 956,825	$ 754,728	$ 3,890,296	$ 3,592,667	$ 3,422,181
Gross profit	243,291	305,516	291,775	159,979	239,706	304,209	292,184	164,718	1,000,561	1,000,817	857,533
Operating earnings	151,234	229,487	193,987	72,400	173,799	227,076	213,786	64,921	647,108	679,582	549,778
Earnings from continuing operations	327,969	110,150	111,749	43,523	108,063	145,137	127,241	41,965	593,391	422,406	232,914
Net earnings	$ 327,546	$ 108,579	$ 120,139	$ 44,921	$ 112,600	$ 142,024	$ 124,709	$ 40,158	$ 601,185	$ 419,491	$ 221,177
Basic earnings per share from continuing operations	$ 2.47	$ 0.83	$ 0.84	$ 0.33	$ 0.82	$ 1.09	$ 0.95	$ 0.31	$ 4.48	$ 3.17	$ 1.75
Diluted earnings per share from continuing operations	2.43	0.82	0.83	0.32	0.80	1.07	0.93	0.31	4.40	3.11	1.72
Basic net earnings per share	2.47	0.82	0.91	0.34	0.85	1.07	0.93	0.30	4.54	3.15	1.66
Diluted net earnings per share	$ 2.43	$ 0.81	$ 0.89	$ 0.33	$ 0.83	$ 1.05	$ 0.92	$ 0.30	$ 4.46	$ 3.09	$ 1.64