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Basis of Presentation - Summary of Proforma EPS (Details)		3 Months Ended		9 Months Ended
	Oct. 22, 2018	Sep. 30, 2018 $ / shares	Sep. 30, 2017 $ / shares	Sep. 30, 2018 $ / shares	Sep. 30, 2017 $ / shares
Subsequent Event [Line Items]
Basic EPS stock split proforma (usd per share)		$ 0.62	$ 0.42	$ 1.66	$ 1.22
Diluted EPS stock split proforma (usd per share)		$ 0.62	$ 0.41	$ 1.63	$ 1.20
Subsequent Event
Subsequent Event [Line Items]
Stock split, conversion ratio	2

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Pro forma basic earnings per share or earnings per unit, which is commonly presented in initial public offerings based on the terms of the offering.

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