SHARE INCENTIVE PLANS (Shares Reserved, ESPP Assumptions) (Details) - shares	6 Months Ended
Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Number of Shares
Share options outstanding (in shares)	294,038
Shares authorized for future issuance (in shares)	537,246
Common stock, capital shares reserved for future issuance (in shares)	7,477,798
Restricted Share Units Outstanding
Number of Shares
Restricted share units outstanding (in shares)	3,873,741		3,294,163
Employee stock
Number of Shares
Shares authorized for future issuance (in shares)	2,772,773
Weighted average assumptions
Dividend yield	0.00%	0.00%
Expected volatility	42.60%	37.20%
Risk free interest rate	2.44%	1.20%
Expected life, years	15 days	15 days

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- Definition

Aggregate number of common shares reserved for future issuance.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
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- Definition

The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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- Definition

The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

+ References

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The risk-free interest rate assumption that is used in valuing an option on its own shares.

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- Definition

Rate of weighted-average expected volatility for award under share-based payment arrangement.

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- Definition

The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
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- Definition

The number of shares reserved for issuance pertaining to the outstanding stock options as of the balance sheet date for all option plans in the customized range of exercise prices.

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- Definition

Expected term of award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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