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Tax Receivable Agreement Liability Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended
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Dec. 31, 2017 | Sep. 30, 2017 | Dec. 31, 2017 | Dec. 31, 2016 | Jun. 30, 2017
Tax Receivable Agreement [Abstract] |  |  |  |  |
Effective income tax rate reconciliation, at federal statutory income tax rate, percent |  |  | 35.00% |  |
Adjustment to tax receivable agreement liability | $ 30,317 | $ 2,615 | $ (27,702) | $ 0 | $ 8,140
Tax receivable agreement, percentage of realized cash saving in tax to pass through | 8500.00% |  | 8500.00% |  |
Deferred Tax Assets, Investment in Subsidiaries | $ 105,886 |  | $ 105,886 |  | $ 109,375

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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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