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Tax Receivable Agreement Liability (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Dec. 31, 2017 | Dec. 31, 2016 | Jun. 30, 2017
Tax Receivable Agreement [Line Items] |  |  |  |  |
Tax receivable agreement, percentage of realized cash saving in tax to pass through | 8500.00% |  | 8500.00% |  |
Tax Receivable Agreement [Roll Forward] |  |  |  |  |
Payable pursuant to tax receivable agreement |  | $ 82,291 | $ 82,291 | $ 93,750 | $ 93,750
Additions (reductions) to tax receivable agreement: |  |  |  |  |
Adjustment to tax receivable agreement liability | $ 30,317 | 2,615 | (27,702) | $ 0 | 8,140
Payments under tax receivable agreement |  |  | 0 |  | (4,279)
Payable pursuant to tax receivable agreement | 55,848 |  | 55,848 |  | 82,291
Less current portion under tax receivable agreement | (4,323) |  | (4,323) |  | (4,332)
Payable pursuant to tax receivable agreement |  | $ 77,959 | 77,959 |  |
Deferred Tax Assets, Investment in Subsidiaries | $ 105,886 |  | 105,886 |  | 109,375
Exchange of LLC Units for Class A Shares |  |  |  |  |
Additions (reductions) to tax receivable agreement: |  |  |  |  |
Exchange of LLC Units for Class A Common Stock |  |  | 1,259 |  | 960
Adjustment to tax receivable agreement liability |  |  | $ (27,702) |  | $ (8,140)

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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from the entity's investment in its wholly-owned subsidiaries. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=96869850&loc=d3e28680-109314 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32621-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32632-109319 + Details
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