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LEASES - Narrative (Details) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2020
Jun. 30, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Dec. 31, 2018
LEASES            
Operating lease right-of-use asset $ 64,294   $ 68,763      
Short-term lease liability 10,902   11,406      
Long-term lease liability 53,543   56,164      
Total equity $ 794,598 $ 797,643 $ 806,083 $ 818,299 $ 818,541 $ 823,324
Package of practical expedients true          
ASC 842 | Cumulative Effect, Period of Adoption, Adjustment            
LEASES            
Operating lease right-of-use asset           70,800
Short-term lease liability           8,200
Long-term lease liability           61,200
Total equity           $ 0
Minimum            
LEASES            
Operating lease, lease term 3 years          
Finance lease, lease term 3 years          
Maximum            
LEASES            
Operating lease, lease term 10 years          
Finance lease, lease term 10 years