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DEBT - CREDIT AGREEMENT (Details)
1 Months Ended 3 Months Ended 9 Months Ended
Dec. 31, 2017
USD ($)
Apr. 30, 2016
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Mar. 31, 2017
USD ($)
Credit Agreement              
Credit Agreement              
Maximum borrowing capacity $ 100,000,000   $ 100,000,000   $ 100,000,000    
Amount of additional borrowings by which maximum borrowing capacity may be increased 100,000,000            
Outstanding borrowings 0   0   0   $ 0
Credit Agreement Availability              
Minimum liquidity level allowing unrestricted access to the Credit Agreement 300,000,000            
Available borrowings 98,325,000   98,325,000   98,325,000   98,320,000
Outstanding letters of credit $ 1,664,000   1,664,000   1,664,000   $ 1,664,000
Interest expense and fees     $ 111,000 $ 111,000 $ 332,000 $ 332,000  
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 4.50%   4.50%   4.50%    
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 1.57%   1.57%   1.57%    
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   $ 5,000,000   $ 5,000,000