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Allowance for Doubtful Accounts - Changes In Carrying Amount (Details) - USD ($)
$ in Thousands
3 Months Ended
Sep. 30, 2018
Jun. 30, 2018
Allowance for Doubtful Accounts Receivable [Roll Forward]    
Balance as of beginning of the period $ 9,741  
Bad debt expense 2,999  
Write-off /adjustments 230  
Balance as of end of the period 12,970  
Unbilled receivables $ 56,100 $ 55,500