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Allowance for Doubtful Accounts - Changes In Carrying Amount (Details) - USD ($)
$ in Thousands
6 Months Ended
Dec. 31, 2018
Jun. 30, 2018
Allowance for Doubtful Accounts Receivable [Roll Forward]    
Balance as of beginning of the period $ 9,741  
Bad debt expense 8,036  
Write-off /adjustments (1,521)  
Balance as of end of the period 16,256  
Unbilled receivables $ 70,200 $ 55,500