LEASES - Other Information Related to Leases (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases			$ 2,743		$ 6,578
Operating cash flows from finance leases	$ 616	$ 0	1,231	$ 0	14
Financing cash flows from finance leases			(399)		(12)
Right-of-use assets obtained in exchange for lease liabilities:
Operating leases			1,196		3,014
Finance leases			$ 146		$ 30,404
Weighted-average remaining lease term:
Operating leases (in years)	3 years 2 months 20 days		3 years 2 months 20 days		3 years 4 months 24 days
Finance leases (in years)	14 years 4 months 25 days		14 years 4 months 25 days		14 years 11 months 22 days
Weighted-average discount rate:
Operating leases	9.14%		9.14%		9.27%
Finance leases	8.00%		8.00%		8.00%