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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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