STOCKHOLDERS' EQUITY, Information Related to Stock Options Outstanding (Details) shares in Thousands	12 Months Ended
	Dec. 31, 2017 $ / shares shares
Stock options outstanding by price range [Abstract]
Shares Outstanding (in shares) | shares	946
Weighted Average Remaining Contractual Term of Options Outstanding	6 years 3 months 18 days
Weighted Average Exercise Price of Options Outstanding (in dollars per share)	$ 55.44
Number of Options Exercisable (in shares) | shares	493
Weighted Average Exercise Price of Options Exercisable (in dollars per share)	$ 41.01
$13.61 - $34.81 [Member]
Stock options outstanding by price range [Abstract]
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	209
Weighted Average Remaining Contractual Term of Options Outstanding	2 years 7 months 6 days
Weighted Average Exercise Price of Options Outstanding (in dollars per share)	$ 25.79
Number of Options Exercisable (in shares) | shares	208
Weighted Average Exercise Price of Options Exercisable (in dollars per share)	$ 25.79
$38.10 - $59.95 [Member]
Stock options outstanding by price range [Abstract]
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	278
Weighted Average Remaining Contractual Term of Options Outstanding	5 years 7 months 6 days
Weighted Average Exercise Price of Options Outstanding (in dollars per share)	$ 51.34
Number of Options Exercisable (in shares) | shares	219
Weighted Average Exercise Price of Options Exercisable (in dollars per share)	$ 49.47
$60.01 - $80.26 [Member]
Stock options outstanding by price range [Abstract]
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	459
Weighted Average Remaining Contractual Term of Options Outstanding	8 years
Weighted Average Exercise Price of Options Outstanding (in dollars per share)	$ 71.37
Number of Options Exercisable (in shares) | shares	66
Weighted Average Exercise Price of Options Exercisable (in dollars per share)	$ 60.99