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Long-Term Obligations (Details Textual) - Pricing Tier [Domain] - Variable Rate [Domain] - USD ($)
$ in Thousands
6 Months Ended 9 Months Ended 21 Months Ended
Jun. 30, 2015
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2014
Debt Instrument [Line Items]          
Debt obligations $ 796,230       $ 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 $ 600,000       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 $ 196,000       $ 135,000