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Tax Receivable Agreements (Details) - USD ($) $ in Thousands			1 Months Ended	3 Months Ended	12 Months Ended
	Jan. 01, 2018	Apr. 15, 2015	Feb. 28, 2017	Mar. 31, 2018	Dec. 31, 2017
Tax Receivable Agreements [Abstract]
Payment on applicable cash tax savings (as a percent)		85.00%
First payment made			$ 7,000
Deferred tax assets related to exchange of units		$ 220,800
Minimum tax receivable agreement obligation over the agreed period		300
Maximum tax receivable agreement obligation over the agreed period		$ 12,800
Period over which the obligations are to be settled		15 years
Reduction of paid-in capital for the difference between TRA liability and related deferred tax asset.		$ 19,900
U.S. federal statutory rate (as a percent)	21.00%				35.00%
Reduction to additional paid-in capital as a result of differences between estimate and tax returns				$ 86,600
Deferred tax assets				99,100	$ 101,600
Tax receivable agreement obligations				$ 147,040	$ 147,040

X

- Definition

Amount of other increase (decrease) in additional paid in capital (APIC).

+ References

No definition available.

+ Details

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X

- Definition

Amount after allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (b),(c)
-URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32537-109319

+ Details

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Period Type:	instant

X

- Definition

Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 12
-URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32687-109319

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB TOPIC 6.I)
-URI http://asc.fasb.org/extlink&oid=34349781&loc=d3e330036-122817

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 13
-URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32698-109319

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X

- Definition

Amount of addition (reduction) to additional paid-in capital as a result of differences between estimate and tax returns.

+ References

No definition available.

+ Details

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X

- Definition

Represents the amount before allocation of valuation allowances of deferred tax asset attributable to exchange of units for shares in the reorganization process.

+ References

No definition available.

+ Details

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X

- Definition

Company made its first payment under the tax receivable agreement.

+ References

No definition available.

+ Details

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Balance Type:	credit
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X

- Definition

Represents the carrying amount on the reporting date of the obligations relating to the tax receivable agreement.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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X

- Definition

Represents the maximum range of yearly payment on the carrying amount on the reporting date of the obligations relating to the tax receivable agreement to be paid over the agreed period.

+ References

No definition available.

+ Details

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- Definition

Represents the minimum range of yearly payment on the carrying amount on the reporting date of the obligations relating to the tax receivable agreement to be paid over the agreed period.

+ References

No definition available.

+ Details

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X

- Definition

Represents the term of settlement of obligations under the tax receivable agreement.

+ References

No definition available.

+ Details

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X

- Definition

Represents the percentage of applicable cash tax savings, which the entity will pay to the counterparty under the terms of the agreement.

+ References

No definition available.

+ Details

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X

- Definition

Tax Receivable Agreements [Abstract]

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