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EMPLOYEE BENEFIT PLANS - Incentive Compensations Narrative (Details) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 3 Months Ended 6 Months Ended
Jun. 30, 2017
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Mar. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Common stock shares reserved   10,646,729   10,646,729    
Common stock, par value (in dollars per share)   $ 0.01   $ 0.01   $ 0.01
Shares available for grant   2,309,469   2,309,469    
Stock based compensation expense   $ 2,400 $ 2,000 $ 6,542 $ 6,244  
Restricted stock grants- shares       600,618    
Weighted average grant date fair value (in dollars per share)       $ 7.15    
Stock option grants- shares       1,256,043    
Phantom Share Units (PSUs)            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Deferred compensation payout period 3 years          
Noncurrent deferred compensation liability   400   $ 400    
Share-based compensation expense       $ 400    
Performance cash            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Award requisite service period       3 years    
Performance cash compensation liability   7,700   $ 7,700   $ 14,200
Performance cash compensation expense   $ 4,400 $ 3,600 $ 1,400 $ 2,500