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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Fair values of financial assets and liabilities (Details) - USD ($)
$ in Thousands
Jun. 30, 2020
Jun. 30, 2019
Fair Value of Financial Instruments    
Liabilities-contingent consideration $ 13,867 $ 16,577
Recurring    
Fair Value of Financial Instruments    
Assets - Insurance company contracts 37,155 35,899
Liabilities-contingent consideration 13,867 16,577
Recurring | Level 2    
Fair Value of Financial Instruments    
Assets - Insurance company contracts 37,155 35,899
Recurring | Level 3    
Fair Value of Financial Instruments    
Fair value of assets 0 0
Liabilities-contingent consideration $ 13,867 $ 16,577