Fair Value Measurements (Narrative) (Details) (USD $)	3 Months Ended			0 Months Ended	3 Months Ended				3 Months Ended
	Mar. 31, 2013 lb	Mar. 31, 2012	Dec. 31, 2012	Apr. 04, 2012 Vacant Owned Facilities [Member]	Mar. 31, 2013 Vacant Owned Facilities [Member] property	Mar. 31, 2012 Vacant Owned Facilities [Member] property	Mar. 31, 2012 Other Indentifiable Intangible Assets [Member]	Mar. 31, 2012 Net Assets Of Acquired Businesses [Member]	Mar. 31, 2012 Cost of Sales [Member] Other Indentifiable Intangible Assets [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Percentage of deferred compensation invested in life insurance contracts	65.00%
Number of years long-term sales growth forecasted over	4 years
Average long-term sales growth forecast, over next 4 years, percent per year	25.00%
Amount of aluminum owned through derivative instruments	3,100,000
Percentage of anticipated aluminum purchases	10.00%
Average mid-west aluminum price per pound	1.02
Derivative liabilities recorded in accrued expenses and other current liabilities	$ 100,000
Derivative asset recorded in prepaid expenses and other current assets			200,000
Number of pounds settled at loss	1,700,000
Amount settled at loss	100,000
Number of vacant facilities owned					4	7
Combined carrying value	5,225,000	12,061,000			5,225,000	10,324,000	642,000	1,095,000
Number of vacant owned facilities classified in fixed assets						6
Proceeds from sale of facility				2,000,000
Number of vacant facilities owned that did not exceed their carrying value						2
Impairment charge						300,000
Non-cash impairment charge							600,000		500,000
Gain due to early termination of leases of vacant facilities		$ 200,000