Discontinued Operations (Narrative) (Details) (USD $)	3 Months Ended			0 Months Ended	3 Months Ended	12 Months Ended
	Mar. 31, 2012	Mar. 31, 2011	Dec. 31, 2011	Jan. 11, 2012 Albany Door Systems [Member]	Mar. 31, 2011 Albany Door Systems [Member]	Dec. 31, 2011 Albany Door Systems [Member]	Mar. 31, 2012 Albany Door Systems [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from sale of business						$ 130,000,000
Gain on sale of discontinued business	57,968,000			57,968,000
Pre-tax gain receivable							17,400,000
Noncurrent portion of purchase price							13,000,000
Noncurrent portion of purchase price, at present value							12,400,000
Accounts receivable, net	$ 152,126,000		$ 148,849,000				$ 5,000