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Long-Term Obligations (Details Textual) - USD ($)
$ in Thousands
9 Months Ended 21 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Sep. 30, 2015
Jun. 30, 2017
Dec. 31, 2014
Debt Instrument [Line Items]          
Debt obligations     $ 824,730   $ 735,230
Voting equity guarantee on indebtedness, percentage     65.00%    
Non-voting equity guarantee on indebtedness, percentage     100.00%    
Senior Notes [Member]          
Debt Instrument [Line Items]          
Debt obligations     $ 592,500   600,000
Forecast [Member] | Senior Notes [Member]          
Debt Instrument [Line Items]          
Principal payment (quarterly) $ 15,000 $ 11,300   $ 7,500  
Revolving line of credit [Member]          
Debt Instrument [Line Items]          
Debt obligations     $ 232,000   $ 135,000