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DEBT - CREDIT AGREEMENT (Details)
1 Months Ended 3 Months Ended
Apr. 30, 2016
USD ($)
Jun. 30, 2017
USD ($)
Jun. 30, 2016
USD ($)
Mar. 31, 2017
USD ($)
Credit Agreement        
Credit Agreement        
Maximum borrowing capacity $ 100,000,000      
Amount of additional borrowings by which maximum borrowing capacity may be increased $ 100,000,000      
Outstanding borrowings   $ 0   $ 0
Credit Agreement Availability        
Minimum liquidity level allowing unrestricted access to the Credit Agreement   300,000,000    
Available borrowings   98,336,000   98,320,000
Outstanding letters of credit   1,664,000   $ 1,664,000
Interest expense and fees   $ 110,000 $ 0  
Trailing period for measurement of interest coverage ratio 12 months      
Maximum liquidity level triggering the requirement to maintain an interest coverage ratio of one to one $ 30,000,000      
Credit Agreement | Minimum        
Credit Agreement        
Monthly fee on unused available balance (as a percent) 0.25%      
Credit Agreement Availability        
Interest coverage ratio 1      
Credit Agreement | Maximum        
Credit Agreement        
Monthly fee on unused available balance (as a percent) 0.375%      
Credit Agreement | Base rate        
Credit Agreement        
Interest rate, variable rate basis   base rate    
Interest rate at end of period   4.25%    
Credit Agreement | Base rate | Minimum        
Credit Agreement        
Interest rate added to base rate   0.25%    
Credit Agreement | Base rate | Maximum        
Credit Agreement        
Interest rate added to base rate   0.75%    
Credit Agreement | LIBOR        
Credit Agreement        
Interest rate, variable rate basis   LIBOR    
Interest rate at end of period   2.48%    
Credit Agreement | LIBOR | Minimum        
Credit Agreement        
Interest rate added to base rate   1.25%    
Credit Agreement | LIBOR | Maximum        
Credit Agreement        
Interest rate added to base rate   1.75%    
Letter of Credit        
Credit Agreement        
Maximum borrowing capacity $ 5,000,000