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Supplemental Financial Information - Schedule of accounts receivable, net (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Jun. 30, 2017
Accounts receivable, net    
Accounts receivable $ 63,591 $ 70,394
Unbilled fees and services 2,654 2,815
Accounts and other receivable, gross 66,245 73,209
Less: Allowance for doubtful accounts (251) (420)
Accounts receivable, net $ 65,994 $ 72,789