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BUSINESS COMBINATIONS - Pro forma information (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Additional information        
Revenue since acquisition included in consolidated statements of operations $ 70,400   $ 157,000  
Operating loss since acquisition included in consolidated statements of operations 12,300   316,300  
Acquisition-related costs included in selling, general and administrative expenses 2,973 $ 2,530 5,880 $ 2,671
NRC        
Pro forma combined:        
Revenue   276,862   508,057
Net income   $ 6,163   $ 3,306
Additional information        
Acquisition-related costs included in selling, general and administrative expenses $ 2,900   $ 5,800