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BUSINESS DESCRIPTION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Non-Current Assets Held for Sale (Details) - USD ($)
$ in Thousands
1 Months Ended 12 Months Ended
Dec. 31, 2019
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2018
Mar. 31, 2019
Long Lived Assets Held-for-sale [Line Items]          
Term of contract         10 years
Non-current assets held for sale   $ 0 $ 5,276    
Proceeds from sale of company headquarters $ 9,000 8,996 0 $ 0  
Gain from sale of company headquarters, net $ 2,500 $ (2,513) 0 $ 0  
Minimum          
Long Lived Assets Held-for-sale [Line Items]          
Term of contract   1 year      
Maximum          
Long Lived Assets Held-for-sale [Line Items]          
Term of contract   20 years      
Land          
Long Lived Assets Held-for-sale [Line Items]          
Non-current assets held for sale     1,700    
Buildings          
Long Lived Assets Held-for-sale [Line Items]          
Non-current assets held for sale     $ 3,600