Fair Value Measurements (Narrative) (Details) (USD $)	6 Months Ended
	Jun. 30, 2013 lb	Jun. 30, 2012	Dec. 31, 2012
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	1,400,000
Percentage of anticipated aluminum purchases	5.00%
Average mid-west aluminum price per pound	1.02
Price per pound of Midwest aluminium	0.95
Derivative liabilities recorded in accrued expenses and other current liabilities	$ 200,000
Derivative asset recorded in prepaid expenses and other current assets			200,000
Number of pounds settled at loss	3,300,000
Amount settled at loss	100,000
Combined carrying value	4,802,000	9,379,000
Charge due to early termination of leases of vacant facilities		(100,000)
Vacant Owned Facilities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Number of vacant facilities owned	4	7
Number of vacant facilities reopened	1
Combined carrying value	3,726,000	7,392,000
Number of vacant owned facilities classified in fixed assets		5
Number of vacant facilities owned that did not exceed their carrying value	1	2
Impairment charge	100,000	300,000
Number of vacant owned properties classified as fixed assets	2
Estimated combined fair value		10,100,000
Vacant Owned Facilities Classified In Fixed Assets [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Estimated combined fair value	4,000,000
Other Indentifiable Intangible Assets [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Combined carrying value		642,000
Non-cash impairment charge		600,000
Cost of Sales [Member] | Other Indentifiable Intangible Assets [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Non-cash impairment charge		$ 500,000