Treasury Stock - Narrative (Details) - USD ($)	Jul. 26, 2018	Jun. 30, 2018	May 11, 2018
Equity, Class of Treasury Stock [Line Items]
Share value available for repurchase		$ 3,600,000
Subsequent Event
Equity, Class of Treasury Stock [Line Items]
Open market share value authorized for repurchase	$ 5,400,000.0
Share Repurchase Plan - Authorized May 16, 2018
Equity, Class of Treasury Stock [Line Items]
Open market share value authorized for repurchase			$ 10,000,000.0
Share Repurchase Plan - Authorized July 26, 2018 | Subsequent Event
Equity, Class of Treasury Stock [Line Items]
Open market share value authorized for repurchase	$ 5,000,000.0