EMPLOYEE BENEFIT PLANS - Option Plans Activity (Details) shares in Thousands	12 Months Ended
	Dec. 31, 2019 $ / shares shares
Shares Under Option
Options outstanding, beginning balance (in shares) | shares	677
Granted (in shares) | shares	121
Exercised (in shares) | shares	(305)
Forfeited (in shares) | shares	0
Options outstanding, ending balance (in shares) | shares	493
Options exercisable, ending balance (in shares) | shares	109
Weighted-Average Exercise Price
Options outstanding, beginning balance (in dollars per share) | $ / shares	$ 213.17
Granted (in dollars per share) | $ / shares	304.59
Exercised (in dollars per share) | $ / shares	189.24
Forfeited (in dollars per share) | $ / shares	0
Options outstanding, ending balance (in dollars per share) | $ / shares	250.46
Options exercisable, ending balance (in dollars per share) | $ / shares	$ 216.49