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ACQUISITIONS (Income Statement Effect) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Business Acquisition [Line Items]        
Revenues $ 445,647 $ 348,977 $ 869,795 $ 673,628
Continuum        
Business Acquisition [Line Items]        
Revenues 8,470   $ 10,224  
Continuum | Amortization expense        
Business Acquisition [Line Items]        
Adjustment related to incomplete initial accounting 26      
Continuum | Rent expense        
Business Acquisition [Line Items]        
Adjustment related to incomplete initial accounting $ 41