LEASES (Supplemental lease information) (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2020	Dec. 31, 2019
Cash paid for amounts included in the measurement of lease liabilities
Operating cash flows used for operating leases	$ 4,019	$ 3,873
Operating Lease, Liability, Current	10,668	12,958
Operating Lease, Liability, Noncurrent	15,718	17,953
Total operating lease liabilities	(26,386)	(30,911)
Operating Lease, Right-of-Use Asset	$ 28,940	$ 33,718
Operating Lease, Weighted Average Discount Rate, Percent	7.18%	7.16%
Operating Lease, Weighted Average Remaining Lease Term	3 years 3 months	3 years 2 months 27 days