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Tax Receivable Agreement Liability - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Jun. 30, 2018
Income Tax Contingency [Line Items] |  |  |  |  |
Tax receivable agreement, percentage of realized cash saving in tax to pass through |  |  | 85.00% |  |
Adjustment to tax receivable agreement liability | $ 30,317 |  | $ 0 | $ (27,702) |
Investment in subsidiaries |  |  | $ 110,435 |  | $ 107,293
Other Operating Income (Expense) |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |
Adjustment to tax receivable agreement liability |  | $ 6,047 |  |  |

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