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FAIR VALUE MEASUREMENTS - Roll forward of Level 3 Measurements (Details) - Contingent consideration - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Level 3 measurements      
Balance at beginning of the period $ (12,100)   $ (52,665)
Change in fair value (3,364) $ 3,675 8,922
Payments 8,569   $ 43,743
Balance at end of the period $ (6,895) (12,100)  
Affinity Biotech, Inc.      
Level 3 measurements      
Acquisition   (35)  
Comfort Infusion, Inc.      
Level 3 measurements      
Acquisition   (3,800)  
WRB Communications, LLC      
Level 3 measurements      
Acquisition   (530)  
Accurate Rx Pharmacy Consulting, LLC      
Level 3 measurements      
Acquisition   (1,980)  
Focus Rx Pharmacy Services Inc. and Focus Rx Inc.      
Level 3 measurements      
Acquisition   $ (2,080)