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FAIR VALUE MEASUREMENTS - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Jun. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Fair Value Measurement [Line Items]          
Right of use impairment charge $ 1,200        
Impairment charges 1,804   $ 0 $ 16,306 $ 0
Minimum [Member]          
Fair Value Measurement [Line Items]          
Threshold period, past due for payment of services provided       15 days  
Maximum [Member]          
Fair Value Measurement [Line Items]          
Threshold period, past due for payment of services provided       60 days  
Nurse And Allied Staffing [Member]          
Fair Value Measurement [Line Items]          
Impairment of indefinite lived asset   $ 14,500      
Leasehold Improvements, Property And Equipment [Member]          
Fair Value Measurement [Line Items]          
Write off of property, plant and equipment $ 600