Segment Information (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015 USD ($)	Jun. 30, 2014 USD ($)	Jun. 30, 2015 USD ($) segment	Jun. 30, 2014 USD ($)
Segment Reporting, Other Significant Reconciling Item [Line Items]
Number of reportable segments | segment			2
Net sales:	$ 253,171	$ 234,960	$ 453,786	$ 425,992
Income (loss) from operations:	44,119	40,123	74,034	69,987
Unallocated Corporate Expenses	(7,064)	(2,335)	(12,233)	(7,203)
Total income (loss) from operations	11,201	14,730	20,171	15,063
Residential Products
Segment Reporting, Other Significant Reconciling Item [Line Items]
Net sales:	134,669	117,400	241,464	204,383
Income (loss) from operations:	11,910	11,089	24,043	13,182
Industrial and Infrastructure Products
Segment Reporting, Other Significant Reconciling Item [Line Items]
Net sales:	101,900	117,938	196,185	222,284
Income (loss) from operations:	5,356	5,976	7,362	9,084
RBI
Segment Reporting, Other Significant Reconciling Item [Line Items]
Net sales:	17,084	0	17,084	0
Income (loss) from operations:	999	0	999	0
Intersegment Sales
Segment Reporting, Other Significant Reconciling Item [Line Items]
Net sales:	(482)	(378)	(947)	(675)
Intersegment Elimination | Industrial and Infrastructure Products
Segment Reporting, Other Significant Reconciling Item [Line Items]
Net sales:	$ 101,418	$ 117,560	$ 195,238	$ 221,609