LEASES LEASES - Supplemental Balance Sheet (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Leases [Abstract]
Operating lease right-of-use asset	$ 135,190	$ 0
Current operating lease liability	23,328
Long-term operating lease liability	117,789	$ 0
Total operating lease liabilities	141,117
Property, plant and equipment	15,561
Accumulated depreciation	(5,014)
Property, plant and equipment, net	10,547
Current finance lease liability	777
Long-term finance lease liability	11,431
Total finance lease liabilities	$ 12,208
Operating Lease, Weighted Average Remaining Lease Term	8 years 1 month 6 days
Finance Lease, Weighted Average Remaining Lease Term	10 years 2 months 12 days
Operating Lease, Weighted Average Discount Rate, Percent	3.85%
Finance Lease, Weighted Average Discount Rate, Percent	4.05%