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FAIR VALUE OF FINANCIAL INSTRUMENTS - Fair Value Hierarchy (Details) - USD ($)
$ in Thousands
Jun. 30, 2017
Jun. 30, 2016
Liabilities:    
Debt $ 257,250 $ 203,500
Level 1    
Liabilities:    
Debt 0 0
Level 2    
Liabilities:    
Debt 257,250 203,500
Level 3    
Liabilities:    
Debt $ 0 $ 0