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Commitments and Contingencies - Product Warranties (Details) - USD ($)
$ in Thousands
6 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Changes in provision for warranties    
Warranty provision at beginning of period $ 15,178 $ 15,948
Additions and adjustments 7,184 5,077
Reductions for warranty repair costs (3,619) (2,752)
Warranty provision at end of period $ 18,743 $ 18,273