EARNINGS PER SHARE (Computation of Basic and Diluted Earnings Per Share) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Numerator (basic and diluted):
Net income	$ 518,973	$ 558,652	$ 585,451	$ 501,609	$ 392,945	$ 527,252	$ 531,667	$ 300,438	$ 2,164,685	$ 1,752,302	$ 1,391,042
Denominator:
Denominator for basic earnings per share - weighted-average shares									68,967	73,817	76,985
Effect of stock options									644	645	803
Denominator for diluted earnings per share - weighted-average shares and assumed conversion									69,611	74,462	77,788
Earnings per share - basic	$ 7.71	$ 8.14	$ 8.41	$ 7.13	$ 5.45	$ 7.13	$ 7.16	$ 4.00	$ 31.39	$ 23.74	$ 18.07
Earnings per share - assuming dilution	$ 7.64	$ 8.07	$ 8.33	$ 7.06	$ 5.40	$ 7.07	$ 7.10	$ 3.97	$ 31.10	$ 23.53	$ 17.88
Antidilutive stock options									111	291	229
Weighted-average exercise price per share of antidilutive stock options									$ 479.90	$ 393.42	$ 368.11