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The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

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STOCK PLANS (Details 3) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2014	Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Share-based Compensation arrangement by Share-based payment award, equity instruments others than options, vested and expected to vest, weighted average grant date fair value	$ 42.14
share-based compensation arrangement by share-based payment award, equity instruments other than options, vested and expected to vest, aggregate intrinsic value	$ 24,864
Stock options
Number of Shares
Balance at the beginning of the period (in shares)	4,951,493	5,207,743	4,645,722
Granted (in shares)	1,994,332	1,072,625	1,656,598
Exercised (in shares)	(332,732)	(539,989)	(518,226)
Forfeited (in shares)	(481,126)	(555,897)	(401,048)
Expired (in shares)	(409,149)	(232,989)	(175,303)
Balance at the end of the period (in shares)	5,722,818	4,951,493	5,207,743
Exercisable at the end of the period (in shares)	3,009,133
Vested and expected to vest at the end of the period (in shares)	5,722,818
Weighted Average Exercise Price
Balance at the beginning of the period (in dollars per share)	$ 43.51	$ 42.16	$ 44.03
Granted (in dollars per share)	39.35	43.93	38.20
Exercised (in dollars per share)	21.55	12.55	11.13
Forfeited (in dollars per share)	42.30	48.66	70.27
Expired (in dollars per share)	68.01	74.65	80.91
Balance at the end of the period (in dollars per share)	41.69	$ 43.51	$ 42.16
Exercisable at the end of the period (in dollars per share)	43.03
Vested and expected to vest at the end of the period (in dollars per share)	$ 41.69
Weighted Average remaining contractual term
Balance at the end of the period	7 years 24 days	6 years 10 months 27 days	7 years 4 months 22 days	7 years 3 months 22 days
Exercisable at the end of the period	5 years 4 months 16 days
Vested and expected to vest at the end of the period	7 years 24 days
Aggregate intrinsic value
Balance at the beginning of the period (in dollars)	$ 57,021	$ 37,581	$ 162,340
Exercised (in dollars)	7,418	15,865	21,750
Balance at the end of the period (in dollars)	49,166	$ 57,021	$ 37,581
Exercisable at the end of the period (in dollars)	37,629
Vested and expected to vest at the end of the period (in dollars)	$ 49,166
Weighted average assumptions used to estimate the fair values of each option grant
Risk free interest rate, minimum (as a percent)	2.26%	1.68%	1.03%
Risk free interest rate, maximum (as a percent)	3.05%	2.42%	2.48%
Expected volatility (as a percent)	53.30%	51.40%	53.50%
Expected life of options	5 years 1 month 19 days	5 years 3 months 21 days	5 years 9 months 6 days
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value	$ 19.34	$ 20.78	$ 19.13
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number	499,546	364,403	216,198
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period	331,129	343,583	256,631
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period	(156,450)	(101,379)	(61,487)
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period	(96,261)	(107,061)	(46,939)
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number	577,964	499,546	364,403
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value	$ 47.32	$ 52.85	$ 78.59
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value	38.36	44.23	40.21
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value	49.59	53.76	78.33
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value	43.92	49.98	68.84
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value	$ 42.14	$ 47.32	$ 52.85
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Outstanding	$ 24,864	$ 22,804	$ 11,824		$ 16,602
Share-based Compensation Arrangement by Share-based Payment Award, Restricted Stock Units, Vested and Expected to Vest	577,964,000
Stock options
Weighted average assumptions used to estimate the fair values of each option grant
Expected volatility (as a percent)	52.20%	53.80%	63.40%
Expected life of options	6 months	6 months	6 months
Stock options \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value	$ 13.15	$ 13.85	$ 10.57
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate	1.53%	1.14%	0.37%
Stock options \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value	$ 10.40	$ 10.80	$ 25.28
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate	2.14%	0.62%	0.49%