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LONG-TERM DEBT AND OTHER FINANCING ARRANGEMENTS Long term debt summary (Details) - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
Debt Disclosure [Abstract]    
Long-term debt $ 589,453 $ 590,777
Other credit facilities and finance leases 14,623 16,332
Total long-term debt and other financing arrangements 604,076 607,109
Less: current maturities (6,952) (6,836)
Total non-current long-term debt and other financing arrangements $ 597,124 $ 600,273