COMMITMENTS AND CONTINGENCIES - Supplemental Disclosure of Cash Flow Information (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Cash paid for amounts included in the measurement of liabilities
Operating cash flows from operating leases	$ 5,619	$ 1,098
Non-cash investing and financing activities:
Right-of-use assets obtained in exchange for new operating lease liabilities	1,254	$ 18,653
Accounting Standards Update 2016-02
Non-cash investing and financing activities:
Right-of-use assets obtained in exchange for new operating lease liabilities	$ 17,900