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DEBT - Narrative (Details)
3 Months Ended 4 Months Ended
Jan. 01, 2020
USD ($)
Sep. 04, 2019
Apr. 26, 2019
Jun. 22, 2017
USD ($)
Mar. 31, 2020
USD ($)
Mar. 31, 2019
USD ($)
Sep. 04, 2019
May 06, 2020
USD ($)
Jun. 30, 2019
USD ($)
Mar. 31, 2017
USD ($)
interest_rate_cap_agreement
LONG-TERM DEBT                    
Repayment of debt during 2020         $ 29,139,000          
Repayment of debt during second quarter of 2021         27,998,000          
Interest rate swap agreements                    
LONG-TERM DEBT                    
Amounts reclassified from accumulated other comprehensive income (loss) into income         0          
Unrealized pre-tax (gain) loss on derivatives         2,148,000 $ (140,000)        
Interest rate swap agreements | Designated as hedge | Cash flow hedge                    
LONG-TERM DEBT                    
Interest rate swap and cap agreements notional amount                   $ 133,000,000
Interest rate cap agreements                    
LONG-TERM DEBT                    
Amounts reclassified from accumulated other comprehensive income (loss) into income         0          
Unrealized pre-tax (gain) loss on derivatives         $ 1,057,000 $ 889,000        
Interest rate cap agreements | Designated as hedge | Cash flow hedge                    
LONG-TERM DEBT                    
Interest rate swap and cap agreements notional amount                   $ 147,000,000
Number of interest rate swap agreements | interest_rate_cap_agreement                   2
Credit Agreement 2017, First Amendment                    
LONG-TERM DEBT                    
Financial covenant, net leverage ratio, maximum         7.00          
Credit Agreement 2017, First Amendment | Revolving Credit Facility                    
LONG-TERM DEBT                    
Fees related to debt amendment                 $ 6,021,000  
Third-Party Clinic Loan Agreements | Subsequent Event                    
LONG-TERM DEBT                    
Repayment of debt during 2020               $ 5,676,000    
Repayment of debt during second quarter of 2021               6,893,000    
First Lien Credit Agreement                    
LONG-TERM DEBT                    
Principal payments         $ 2,200,000          
Line of Credit | 2017 Credit Agreement | Revolving Credit Facility                    
LONG-TERM DEBT                    
Aggregate amount of borrowing capacity       $ 100,000,000            
Uncommitted incremental accordion facility, amount       $ 125,000,000            
Uncommitted incremental accordion facility, percentage of consolidated EBITDA       100.00%            
Undrawn commitment fee         0.50%          
Amount borrowed from revolving credit facility         $ 35,500,000          
Revolving credit facility borrowings outstanding         $ 100,000,000          
Interest rate at period end         5.48%          
Financial covenant, net leverage ratio, maximum         6.00          
Line of Credit | Credit Agreement 2017, First Amendment | Revolving Credit Facility                    
LONG-TERM DEBT                    
Revolving credit facility commitment fee as a percentage             0.50%      
Line of Credit | Credit Agreement 2017, First Amendment | Revolving Credit Facility | Eurodollar one-month rate                    
LONG-TERM DEBT                    
Interest rate margin             5.25%      
Line of Credit | Credit Agreement 2017, First Amendment | Revolving Credit Facility | Base Rate                    
LONG-TERM DEBT                    
Interest rate margin             4.25%      
Line of Credit | Credit Agreement 2017, First Amendment | Revolving Credit Facility | Alternate Base Rate Or London Interbank Offered Rate (LIBOR)                    
LONG-TERM DEBT                    
Applicable margin, increase   1.75%                
Term loans | 2017 Credit Agreement                    
LONG-TERM DEBT                    
Principal payments $ 2,200,000                  
Debt face amount       $ 440,000,000            
Required prepayment         $ 0          
Interest rate         5.99%          
Term loans | Credit Agreement 2017, First Amendment | Federal funds effective rate                    
LONG-TERM DEBT                    
Interest rate margin             0.50%      
Term loans | Credit Agreement 2017, First Amendment | Eurodollar one-month rate                    
LONG-TERM DEBT                    
Interest rate margin   5.00%         1.00%      
Term loans | Credit Agreement 2017, First Amendment | ABR rate                    
LONG-TERM DEBT                    
Interest rate margin             4.50%      
Term loans | Credit Agreement 2017, First Amendment | LIBOR rate, adjusted for changes in Eurodollar reserves                    
LONG-TERM DEBT                    
Interest rate margin             5.50%      
Term loans | Credit Agreement 2017, First Amendment | Base Rate                    
LONG-TERM DEBT                    
Interest rate margin   4.00%                
Term loans | Credit Agreement 2017, First Amendment | Debt Instrument, Redemption, Period One                    
LONG-TERM DEBT                    
Debt redemption price, percentage     1.00%              
Term loans | Credit Agreement 2017, First Amendment | Debt Instrument, Redemption, Period Two                    
LONG-TERM DEBT                    
Debt redemption price, percentage     2.00%              
Term loans | First Lien Credit Agreement, Second Amendment | ABR rate                    
LONG-TERM DEBT                    
Interest rate margin       2.25%            
Term loans | First Lien Credit Agreement, Second Amendment | LIBOR rate, adjusted for changes in Eurodollar reserves                    
LONG-TERM DEBT                    
Interest rate margin       3.25%            
Term loans | Term B loans                    
LONG-TERM DEBT                    
Debt face amount                   $ 440,000,000
Third Parties to Clinic Loan Agreements | Third-Party Clinic Loan Agreements | Subsequent Event                    
LONG-TERM DEBT                    
Repayment of debt during 2020               9,917,000    
Repayment of debt during second quarter of 2021               $ 13,619,000