Segment Information (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014 segment	Sep. 30, 2013
Segment Reporting, Other Significant Reconciling Item [Line Items]
Number of reportable segments			2
Net sales:	$ 234,101	$ 217,412	$ 660,093	$ 638,732
Income (loss) from operations:	41,578	41,762	111,565	122,645
Unallocated Corporate Expenses	(1,876)	(2,344)	(9,069)	(15,322)
Total income (loss) from operations	18,392	(6,152)	33,398	15,327
Residential Products
Segment Reporting, Other Significant Reconciling Item [Line Items]
Net sales:	122,100	108,424	326,483	308,536
Income (loss) from operations:	13,694	10,068	26,740	29,925
Industrial and Infrastructure Products
Segment Reporting, Other Significant Reconciling Item [Line Items]
Net sales:	112,329	109,645	334,613	331,689
Income (loss) from operations:	6,574	(13,876)	15,727	724
Intersegment Sales
Segment Reporting, Other Significant Reconciling Item [Line Items]
Net sales:	(328)	(657)	(1,003)	(1,493)
Intersegment Elimination | Industrial and Infrastructure Products
Segment Reporting, Other Significant Reconciling Item [Line Items]
Net sales:	$ 112,001	$ 108,988	$ 333,610	$ 330,196