SHARE INCENTIVE PLANS: (Shares reserved, ESPP assumptions) (Details) - shares	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015
Ordinary shares reserved for future issuance under equity incentive plans
Shares outstanding	1,798,805
Common stock, capital shares reserved for future issuance	10,459,118
Restricted Stock Units (RSUs) [Member]
Ordinary shares reserved for future issuance under equity incentive plans
Restricted share units outstanding	3,779,296		2,205,083
Employee Stock [Member]
Ordinary shares reserved for future issuance under equity incentive plans
Shares authorized for future issuance	4,267,370
Weighted average assumptions
Dividend yield (as a percent)	0.00%	0.00%
Expected volatility (as a percent)	37.60%	38.10%
Risk-free interest rate (as a percent)	0.50%	0.09%
Expected life (in years)	6 months	6 months
Global plan [Member]
Ordinary shares reserved for future issuance under equity incentive plans
Shares authorized for future issuance	613,647