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SHARE-BASED AWARDS AND STOCK OPTIONS - Stock Options Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense	$ 27,877	$ 14,833	$ 55,791	$ 44,937
Employee stock option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense	7,000	$ 700	8,600	2,300
Aggregate intrinsic value of stock options exercised			22,900	$ 15,900
Total unrecognized compensation cost	$ 15,400		$ 15,400
Weighted-average period of unrecognized compensation cost			1 year 8 months 12 days
Weighted average grant date fair value for each option granted (USD per share)	$ 99.56	$ 35.09	$ 99.56	$ 35.09

X

- Definition

Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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-Publisher FASB
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Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Amount of cost to be recognized for option under share-based payment arrangement.

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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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