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

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 14
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3255-108585

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Stockholders' Equity - Follow-On Offering (Details) - USD ($) $ / shares in Units, $ in Thousands	1 Months Ended	12 Months Ended
	May 31, 2018	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Subsidiary, Sale of Stock [Line Items]
Sale of Stock, Price Per Share	$ 53.00
Net proceeds from equity offering	$ 234,000	$ 233,993	$ 0	$ 0
Public Stock Offering
Subsidiary, Sale of Stock [Line Items]
Number of shares issued in transaction	4,645,000	300,000.0
Unwritten Public Stock Offering
Subsidiary, Sale of Stock [Line Items]
Number of shares issued in transaction	645,000
Sale of Stock, Consideration Received Per Transaction	$ 246,200