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Product Warranties - Schedule of Product warranty Liability (Details) - USD ($)
$ in Thousands
3 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Movement in Standard Product Warranty Accrual [Roll Forward]    
Beginning balance $ 17,217 $ 10,050
Add: Warranty expense 2,916 3,008
Additions for Cobalt acquisition 0 4,404
Less: Warranty claims paid (2,134) (2,737)
Ending balance $ 17,999 $ 14,725