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Statements of Operations - Interest Expense and Depreciation and Amortization (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Mar. 31, 2021
Mar. 31, 2020
Interest expense, net        
Amortization of debt issuance costs $ 221 $ 220 $ 662 $ 662
Other 65 153 191 441
Interest expense 3,081 3,661 9,666 11,431
Interest income (148) (398) (709) (1,382)
Interest expense, net 2,933 3,263 8,957 10,049
Depreciation and amortization        
Depreciation of property, plant and equipment 5,763 5,824 17,479 17,395
Amortization of intangible assets 2,155 2,325 6,563 6,659
Amortization of other assets   99 0 123
Depreciation and amortization 7,918 8,248 24,042 24,177
Term Loan        
Interest expense, net        
Interest expense 1,857 1,888 5,796 5,967
Revolving credit facility (the "Revolver")        
Interest expense, net        
Interest expense $ 938 $ 1,400 $ 3,017 $ 4,361