Subsequent Event (Details) - USD ($) $ in Millions			6 Months Ended
	Jul. 26, 2018	Jul. 24, 2018	Jun. 30, 2018
Subsequent Event [Member]
Subsequent Event [Line Items]
Subsequent Event, Date	Jul. 26, 2018	Jul. 24, 2018
Cone Drive [Member]
Subsequent Event [Line Items]
Business Acquisition, Revenue Reported by Acquired Entity for Last Annual Period			$ 100
Rollon Group [Member]
Subsequent Event [Line Items]
Business Acquisition, Revenue Reported by Acquired Entity for Last Annual Period			$ 140