SHARE-BASED AWARDS AND STOCK OPTIONS - Stock Options Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense	$ 42,276	$ 27,877	$ 105,081	$ 55,791
Employee stock option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense	2,400	$ 7,000	6,500	8,600
Aggregate intrinsic value of stock options exercised			69,800	$ 22,900
Total unrecognized compensation cost	$ 10,500		$ 10,500
Weighted-average period of unrecognized compensation cost			1 year 9 months 18 days
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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