The cash inflow from the additional capital contribution to the entity.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 14
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3255-108585

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Stockholders' Equity - Follow-On Offering - Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands	1 Months Ended	6 Months Ended
	May 31, 2018	Jun. 30, 2018	Jun. 30, 2017
Subsidiary, Sale of Stock [Line Items]
Sale of stock (price per share)	$ 53.00
Net proceeds from equity offering	$ 234,000	$ 233,993	$ 0
Public stock offering
Subsidiary, Sale of Stock [Line Items]
Sale of stock (in shares)	4,645,000	300,000.0
Unwritten public stock offering
Subsidiary, Sale of Stock [Line Items]
Sale of stock (in shares)	645,000
Gross proceeds from stock offering	$ 246,200