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SHARE-BASED AWARDS AND OPTIONS - Stock Options Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense	$ 15,205	$ 12,337	$ 30,104	$ 21,153
Employee stock option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense	900	$ 700	1,500	1,300
Aggregate intrinsic value of stock options exercised			4,600	$ 7,500
Total unrecognized compensation cost	$ 5,600		$ 5,600
Weighted-average period of unrecognized compensation cost			2 years 70 days
Weighted average grant date fair value for each option granted (USD per share)	$ 35.09	$ 23.68	$ 35.09	$ 23.68

X

- Definition

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

+ References

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- Definition

Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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- Definition

Unrecognized cost of unvested options awarded to employees as compensation.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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Weighted average grant-date fair value of non-vested options outstanding.

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