LEASES - Amounts Recognized in the Balance Sheet for Leases (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Operating Leases:
Operating lease right-of-use assets	$ 61,505	$ 67,048
Current portion of operating lease obligations	17,055	17,100
Operating lease obligations (non-current)	$ 49,665	$ 54,436
Weighted average remaining lease term, operating leases	5 years 7 months 6 days	5 years 8 months 12 days
Weighted average discount rate, operating leases	7.70%	8.30%
Finance Leases:
Property, plant and equipment, net	$ 4,978	$ 5,156
Current portion of long-term debt and finance lease obligations	316	294
Long-term debt and finance lease obligations	$ 4,953	$ 5,069
Weighted average remaining lease term	12 years 9 months 18 days	13 years 3 months 18 days
Weighted average discount rate	6.20%	6.30%