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Allowance for Doubtful Accounts (Tables)
 6 Months Ended
Dec. 31, 2018
Receivables [Abstract]  
Changes in Carrying Amount of Allowance For Doubtful Accounts
Balance as of June 30, 2018
$
9,741

Bad debt expense
8,036

Write-off /adjustments
(1,521
)
Balance as of December 31, 2018
$
16,256