STOCKHOLDERS' EQUITY - Information Related to Stock Options Outstanding (Details) shares in Thousands	12 Months Ended
	Dec. 31, 2018 $ / shares shares
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Shares Outstanding (in shares) | shares	887
Weighted Average Remaining Contractual Term	6 years 3 months 18 days
Weighted Average Exercise Price of Options Outstanding (in dollars per share)	$ 61.59
Number of Options Exercisable (in shares) | shares	490
Weighted Average Exercise Price of Options Exercisable (in dollars per share)	$ 50.50
$13.61 - $34.81
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of exercise prices, minimum (in dollars per share)	13.61
Range of exercise prices, maximum (in dollars per share)	$ 34.81
Shares Outstanding (in shares) | shares	134
Weighted Average Remaining Contractual Term	2 years
Weighted Average Exercise Price of Options Outstanding (in dollars per share)	$ 28.03
Number of Options Exercisable (in shares) | shares	134
Weighted Average Exercise Price of Options Exercisable (in dollars per share)	$ 28.03
$38.10 - $59.95
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of exercise prices, minimum (in dollars per share)	38.10
Range of exercise prices, maximum (in dollars per share)	$ 59.95
Shares Outstanding (in shares) | shares	195
Weighted Average Remaining Contractual Term	5 years 2 months 12 days
Weighted Average Exercise Price of Options Outstanding (in dollars per share)	$ 52.51
Number of Options Exercisable (in shares) | shares	191
Weighted Average Exercise Price of Options Exercisable (in dollars per share)	$ 52.39
$60.01 - $85.40
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of exercise prices, minimum (in dollars per share)	60.01
Range of exercise prices, maximum (in dollars per share)	$ 85.40
Shares Outstanding (in shares) | shares	558
Weighted Average Remaining Contractual Term	7 years 8 months 12 days
Weighted Average Exercise Price of Options Outstanding (in dollars per share)	$ 72.82
Number of Options Exercisable (in shares) | shares	165
Weighted Average Exercise Price of Options Exercisable (in dollars per share)	$ 66.61