SHARE-BASED AWARDS AND STOCK OPTIONS - Stock Options Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense	$ 34,983	$ 16,496	$ 62,805	$ 27,914
Employee stock option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense	2,200	$ 900	4,100	1,600
Aggregate intrinsic value of stock options exercised			66,500	$ 18,900
Total unrecognized compensation cost	$ 12,600		$ 12,600
Weighted-average period of unrecognized compensation cost			2 years
Weighted average grant date fair value for each option granted (USD per share)	$ 54.85	$ 39.60	$ 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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