LONG-TERM DEBT AND OTHER FINANCING ARRANGEMENTS Long term debt summary (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Dec. 31, 2019
Debt Disclosure [Abstract]
Document Period End Date	Mar. 31, 2020
Long-term debt	$ 576,436	$ 590,777
Other credit facilities and finance leases	14,792	16,332
Total long-term debt and other financing arrangements	591,228	607,109
Less: current maturities	(6,655)	(6,836)
Total non-current long-term debt and other financing arrangements	$ 584,573	$ 600,273