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Commitments and Contingencies - Product Warranties (Details) - USD ($)
$ in Thousands
3 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Changes in provision for warranties    
Warranty provision at beginning of period $ 21,819 $ 15,178
Additions and adjustments 1,480 4,259
Reductions for warranty repair costs (1,800) (2,138)
Warranty provision at end of period $ 21,499 $ 17,299