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Commitments and Contingencies - Product Warranties (Details) - USD ($)
$ in Thousands
3 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Changes in provision for warranties    
Warranty provision at beginning of period $ 21,724 $ 21,819
Additions and adjustments 2,254 1,480
Reductions for warranty repair costs (2,291) (1,800)
Warranty provision at end of period $ 21,687 $ 21,499