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Treasury Stock - Narrative (Details) - USD ($)
Oct. 30, 2018
Sep. 30, 2018
Jul. 26, 2018
Equity, Class of Treasury Stock [Line Items]      
Share value available for repurchase   $ 3,300,000  
Share Repurchase Plan - Authorized July 26, 2018      
Equity, Class of Treasury Stock [Line Items]      
Open market share value authorized for repurchase     $ 5,000,000.0
Share Repurchase Plan - Authorized October 30, 2018 | Subsequent Event      
Equity, Class of Treasury Stock [Line Items]      
Open market share value authorized for repurchase $ 5,000,000.0