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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 |  |

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