Basis of Presentation Subsequent event (Details) - USD ($) $ in Millions	1 Months Ended	9 Months Ended
	Jan. 15, 2018	Dec. 02, 2017	Mar. 03, 2018	Jun. 12, 2017
Business Acquisition [Line Items]
Stock Redeemed or Called During Period, Shares (in shares)		200,000
EFCO Corporation
Business Acquisition [Line Items]
Percentage of voting interests acquired				100.00%
Subsequent Event [Member]
Business Acquisition [Line Items]
Restructuring and Related Cost, Expected Cost			$ 4.5
Subsequent Event [Member] | Share Repurchase Program [Member]
Business Acquisition [Line Items]
Stock Redeemed or Called During Period, Shares (in shares)	246,299
Stock Redeemed or Called During Period, Value	$ 11.1