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Subsequent Events (Details) - USD ($)
3 Months Ended 6 Months Ended 12 Months Ended
Sep. 30, 2018
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2018
Nov. 12, 2018
Subsequent Event [Line Items]              
Debt partial extinguishment   $ 2,467,000 $ 0 $ 2,467,000 $ 0    
Subsequent Event              
Subsequent Event [Line Items]              
Shelf offering amount, suspended $ 50,000,000.0            
Reclassification of debt, net carrying value $ 24,200,000            
Ares Credit Facility | Ares Capital Management | Subsequent Event              
Subsequent Event [Line Items]              
Letter of commitment letter outstanding             $ 120,000,000.0
Revolver 2022 | Ares Capital Management | Subsequent Event              
Subsequent Event [Line Items]              
Letter of commitment letter outstanding             $ 25,000,000.0
Revolver 2022 | London Interbank Offered Rate (LIBOR) | Subsequent Event              
Subsequent Event [Line Items]              
Stated interest rate             3.75%
Term Loan 2023 | Ares Capital Management | Subsequent Event              
Subsequent Event [Line Items]              
Letter of commitment letter outstanding             $ 80,000,000.0
Term Loan 2023 | London Interbank Offered Rate (LIBOR) | Subsequent Event              
Subsequent Event [Line Items]              
Stated interest rate             8.75%
2023 Delayed Draw Term Loan | Ares Capital Management | Subsequent Event              
Subsequent Event [Line Items]              
Letter of commitment letter outstanding             $ 15,000,000.0
Term Loan 2021 | Forecast              
Subsequent Event [Line Items]              
Repayments of debt           $ 25,000,000  
December 2019 Note | Forecast              
Subsequent Event [Line Items]              
Debt partial extinguishment           $ 68,700,000