SHARE-BASED AWARDS AND STOCK OPTIONS - Stock Options Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
Mar. 31, 2020	Mar. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense	$ 27,822	$ 11,418
Employee stock option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense	1,900	700
Aggregate intrinsic value of stock options exercised	53,600	$ 15,900
Total unrecognized compensation cost	$ 14,700
Weighted-average period of unrecognized compensation cost	2 years 2 months 12 days
Weighted average grant date fair value for each option granted (USD per share)	$ 54.85	$ 39.60

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

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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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