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Income Taxes (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Jun. 30, 2017
Income Tax Expense [Line Items]          
Effective income tax rate reconciliation, at federal statutory income tax rate, percent     35.00%    
Deferred Tax Asset Re-measurement due to Tax Reform, increase (decrease) in income tax expense $ 46,989   $ 46,989    
Deferred tax assets, valuation allowance $ 12,537   $ 12,537   $ 10,324
Effective income tax rate reconciliation, percent 344.90% 33.80% 98.40% 33.80%  
Deferred Income Tax Charge [Member]          
Income Tax Expense [Line Items]          
Deferred Tax Asset Re-measurement due to Tax Reform, increase (decrease) in income tax expense $ 40   $ 40    
Tax Receivable Agreement [Member]          
Income Tax Expense [Line Items]          
Deferred Tax Asset Re-measurement due to Tax Reform, increase (decrease) in income tax expense $ 7   $ 7