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Stockholders' Equity - Issuance of Common Stock (Details) - USD ($)	Jul. 02, 2018	Jan. 16, 2018	Dec. 31, 2018	Jun. 29, 2018	Jan. 12, 2018
Business Acquisition [Line Items]
Share price (in usd per share)			$ 31.80
Premier Merger
Business Acquisition [Line Items]
Number of shares issued	2,848,579
Share price (in usd per share)	$ 34.85			$ 34.85
Fair value of shares issued	$ 99,300,000
Puget Sound Merger
Business Acquisition [Line Items]
Number of shares issued		4,112,258
Share price (in usd per share)		$ 31.80			$ 31.80
Fair value of shares issued		$ 130,800,000

X

- Definition

Value of equity interests (such as common shares, preferred shares, or partnership interest) issued or issuable to acquire the entity.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (b)(4)
-URI http://asc.fasb.org/extlink&oid=120321790&loc=d3e6927-128479

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Number of shares of equity interests issued or issuable to acquire entity.

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