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DEFERRED REVENUE (Narrative) (Details) - USD ($)
$ in Thousands
6 Months Ended 12 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2020
Deferred revenue $ 7,264     $ 10,607
Revenue $ 101,636 $ 85,988 $ 122,000  
Minimum [Member]        
Expected to be recognized over periods performance obligations 8 years      
Maximum [Member]        
Expected to be recognized over periods performance obligations 12 years      
Recognized over time for service [Member]        
Revenue       $ 4,761