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Stockholders' Equity - Additional Information (Details) - USD ($)		6 Months Ended
	Apr. 12, 2018	Jun. 30, 2018
Class Of Stock [Line Items]
Stock issued during period shares	5,405,000
Shares issued price per share	$ 37.50
Gross proceeds from issuance of common stock	$ 202,688,000
Net proceeds after underwriting discounts and offering expenses	$ 192,053,000	$ 192,053,000
Over-Allotment Option
Class Of Stock [Line Items]
Stock issued during period shares	705,000

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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)
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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Topic 210
-SubTopic 10
-Section S99
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