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Supplementary Balance Sheet Information - Accounts Receivable (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Jun. 30, 2015
Accounts Receivable    
Account receivable, Gross $ 16,698 $ 32,357
Account receivable, Allowance 1,921 1,636
Account receivable, Net $ 14,777 $ 30,721