SUPPLEMENTAL CASH FLOW INFORMATION - Supplemental Cash Flow Data (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Supplemental Cash Flow Data:
Cash paid for interest	$ 828	$ 397
Cash paid for income taxes	6,376	2,599
Supplemental disclosures of non-cash investing and financing activities:
Right-of-use assets obtained in exchange for operating lease obligations	22,715	255,553
Purchases of property and equipment in accounts payable and accrued expenses	19,580	10,354
Unpaid business combination purchase price	0	7,338
Fair value of common stock issued and issuable in future related to business combination	0	(14,999)
Fair value of common stock issued to settle the conversion of senior notes	(37,204)	(77,614)
Fair value of shares received to settle senior note hedges	$ 1,260,718	$ 0