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LEASES - Components of Lease Expense and Payments (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
LEASES          
Operating lease cost $ 4,029 $ 4,151 $ 8,076 $ 7,667  
Short-term lease cost 729 867 1,271 1,578  
Variable lease cost 1,540 288 2,343 1,250  
Total operating lease cost 6,298 5,306 11,690 10,495  
Payments for lease liabilities     7,200 3,800  
Lease liabilities arising from right-of-use assets     1,700 3,300  
Finance lease cost:          
Amortization of right-of-use asset 522 586 1,094 1,179  
Variable costs 186 262 458 558  
Total finance lease cost 708 $ 848 1,552 $ 1,737  
Finance leases cost included in property, plant and equipment $ 25,200   $ 25,200   $ 25,900
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List] us-gaap:PropertyPlantAndEquipmentGross   us-gaap:PropertyPlantAndEquipmentGross   us-gaap:PropertyPlantAndEquipmentGross
Accumulated depreciation related to finance leases $ 10,000   $ 10,000   $ 9,400