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Related Party Transactions (Details) $ in Thousands			3 Months Ended		6 Months Ended
	Dec. 18, 2018 USD ($)	Aug. 26, 2016	Jun. 30, 2019 USD ($)	Jun. 30, 2018 USD ($)	Jun. 30, 2019 USD ($)	Jun. 30, 2018 USD ($)
Related Party Transaction [Line Items]
Operating lease right-of-use assets			$ 34,428		$ 34,428
Operating lease liabilities			34,502		34,502
Conversion ratio, preferred stock to common stock		1
Percentage retained under tax receivable agreement		15.00%
Estimated termination payment			$ 47,700		$ 47,700
Discount rate, tax receivable agreement liability			5.31%		5.31%
Affiliated Entity
Related Party Transaction [Line Items]
Rent expense			$ 700	$ 1,700	$ 1,400	$ 3,900
Operating lease right-of-use assets			7,200		7,200
Operating lease liabilities			8,000		$ 8,000
Affiliated Entity | Mosing Holdings
Related Party Transaction [Line Items]
Percentage of tax benefits realized payable		85.00%
Cumulative deficit, period					36 months
Tax receivable agreement, estimated liability			$ 200		$ 200
Real Property Acquisition From Mosing Companies | Affiliated Entity
Related Party Transaction [Line Items]
Purchase from related party	$ 37,000
Term for certain rights and obligations within agreement with related party	10 years

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- Definition

Present value of lessee's discounted obligation for lease payments from operating lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 45
-Paragraph 1
-Subparagraph (b)
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-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 45
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