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BUSINESS COMBINATIONS - Pro forma information (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Additional information      
Business development and integration expenses $ 3,274 $ 11,621 $ 26,150
NRC      
Pro forma combined:      
Revenue     1,048,745
Net income (loss)     11,775
Additional information      
Revenue since acquisition included in consolidated statements of operations     70,200
Operating loss since acquisition included in consolidated statements of operations     9,100
Business development and integration expenses $ 2,400 $ 11,500 $ 24,400