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Commitments and Contingencies - Product Warranties (Details) - USD ($)
$ in Thousands
3 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Changes in provision for warranties    
Warranty provision at beginning of period $ 15,178 $ 15,948
Additions and adjustments 4,259 2,822
Reductions for warranty repair costs (2,138) (1,474)
Warranty provision at end of period $ 17,299 $ 17,296