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DEBT - CREDIT AGREEMENT (Details) - USD ($)
3 Months Ended
Feb. 08, 2019
Jun. 30, 2019
Jun. 30, 2018
Mar. 31, 2019
Credit Agreement        
Credit Agreement        
Maximum borrowing capacity $ 200,000,000      
Amount of additional borrowings by which maximum borrowing capacity may be increased $ 250,000,000      
Debt term 5 years      
Available borrowings   $ 198,336,000   $ 198,336,000
Outstanding letters of credit   1,664,000   $ 1,664,000
Interest expense and fees   $ 82,000 $ 110,000  
New Credit Agreement | Base rate        
Credit Agreement        
Interest rate at end of period   5.50%    
New Credit Agreement | Base rate | Minimum        
Credit Agreement        
Interest rate added to base rate 0.25%      
New Credit Agreement | Base rate | Maximum        
Credit Agreement        
Interest rate added to base rate 0.75%      
New Credit Agreement | LIBOR        
Credit Agreement        
Interest rate at end of period   2.40%    
New Credit Agreement | LIBOR | Minimum        
Credit Agreement        
Interest rate added to base rate 1.125%      
New Credit Agreement | LIBOR | Maximum        
Credit Agreement        
Interest rate added to base rate 1.75%      
Letter of Credit        
Credit Agreement        
Maximum borrowing capacity $ 25,000,000