Segment Information (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014 segment	Jun. 30, 2013
Segment Reporting, Other Significant Reconciling Item [Line Items]
Number of reportable segments			2
Net sales:	$ 234,960	$ 224,519	$ 425,992	$ 421,320
Income from operations:	40,123	44,706	69,987	80,883
Unallocated Corporate Expenses	(2,335)	(5,209)	(7,203)	(12,978)
Total operating profit	14,730	16,283	15,063	21,479
Residential Products
Segment Reporting, Other Significant Reconciling Item [Line Items]
Net sales:	117,400	110,448	204,383	200,112
Income from operations:	11,089	13,219	13,182	19,857
Industrial and Infrastructure Products
Segment Reporting, Other Significant Reconciling Item [Line Items]
Net sales:	117,938	114,577	222,284	222,044
Income from operations:	5,976	8,273	9,084	14,600
Intersegment Sales
Segment Reporting, Other Significant Reconciling Item [Line Items]
Net sales:	(378)	(506)	(675)	(836)
Intersegment Elimination | Industrial and Infrastructure Products
Segment Reporting, Other Significant Reconciling Item [Line Items]
Net sales:	$ 117,560	$ 114,071	$ 221,609	$ 221,208