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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - AVAILABLE FOR SALE SECURITIES (Details) - USD ($)
shares in Thousands, $ in Thousands
1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Mar. 15, 2018
Sep. 30, 2015
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Sep. 30, 2017
Schedule of Available-for-sale Securities [Line Items]            
Proceeds from sale of available for sale securities, net     $ 3,400 $ 6,616 $ 6,639  
Pre-tax gain on sale of available-for-sale securities     $ 2,800 5,300 $ 5,400  
Impairment of available for sale securities       17,800    
Other than temporary impairment, net of tax $ 14,800          
Available for sale securities       25,009   $ 65,752
Unrealized gain       (3,200)   12,800
Unrealized gain, net of tax       (2,400)   $ 7,700
Fair Value, Measurements, Nonrecurring            
Schedule of Available-for-sale Securities [Line Items]            
Impairment of available for sale securities       17,838    
Fair Value, Inputs, Level 1 | Fair Value, Measurements, Nonrecurring            
Schedule of Available-for-sale Securities [Line Items]            
Impairment of available for sale securities       $ 17,838    
Common Units            
Schedule of Available-for-sale Securities [Line Items]            
Ownership interest exchanged (in shares)   1,840   1,840    
Deferred gain   $ 24,600        
Minimum            
Schedule of Available-for-sale Securities [Line Items]            
Loans Receivable Term       3 years