Segment Information (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015 USD ($)	Sep. 30, 2014 USD ($)	Sep. 30, 2015 USD ($) segment	Sep. 30, 2014 USD ($)
Segment Reporting, Other Significant Reconciling Item [Line Items]
Number of reportable segments | segment			2
Net sales:	$ 304,994	$ 234,101	$ 758,780	$ 660,093
Income (loss) from operations:	61,396	41,578	135,430	111,565
Unallocated Corporate Expenses	(5,585)	(1,876)	(17,818)	(9,069)
Total income from operations	23,394	18,392	43,565	33,398
Residential Products
Segment Reporting, Other Significant Reconciling Item [Line Items]
Net sales:	126,995	122,100	368,459	326,483
Income (loss) from operations:	15,879	13,694	39,922	26,740
Industrial and Infrastructure Products
Segment Reporting, Other Significant Reconciling Item [Line Items]
Net sales:	96,636	112,329	292,821	334,613
Income (loss) from operations:	8,083	6,574	15,445	15,727
RBI
Segment Reporting, Other Significant Reconciling Item [Line Items]
Net sales:	81,649	0	98,733	0
Income (loss) from operations:	5,017	0	6,016	0
Intersegment Sales
Segment Reporting, Other Significant Reconciling Item [Line Items]
Net sales:	(286)	(328)	(1,233)	(1,003)
Intersegment Elimination | Industrial and Infrastructure Products
Segment Reporting, Other Significant Reconciling Item [Line Items]
Net sales:	$ 96,350	$ 112,001	$ 291,588	$ 333,610