Plants Shutdowns, Asset Impairments, Restructurings And Other (Narrative) (Details) (USD $)	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Restructuring Cost and Reserve [Line Items]
Pretax loss for asset impairments	$ 400,000	$ 0
Other Non-Operating and Non-Recurring Charges [Abstract]
Unrealized gain (loss) on investment under fair value method	0	1,100,000
kaleo
Other Non-Operating and Non-Recurring Charges [Abstract]
Unrealized gain (loss) on investment under fair value method	0	1,100,000
Unrealized gain (loss) on investment under fair value method, after taxes		700,000
AACOA
Other Non-Operating and Non-Recurring Charges [Abstract]
Integration-related expenses and other non-recurring transactions		100,000
Film Products
Restructuring Cost and Reserve [Line Items]
Pretax charges for severance and other employee-related costs	800,000	100,000
Harbinger Fund
Other Non-Operating and Non-Recurring Charges [Abstract]
Cost-method investment, OTTI	200,000
Cost-method investment, OTTI net of tax	100,000
Film Products Manufacturing Facility In Red Springs North Carolina | Facility Closing
Restructuring Cost and Reserve [Line Items]
Plant shutdown related expenditures	500,000
Pretax charges for severance and other employee-related costs	300,000
Pretax loss for asset impairments	200,000
Aluminum Extrusions Manufacturing Facility In Kentland Indiana [Member] | Facility Closing
Restructuring Cost and Reserve [Line Items]
Plant shutdown related expenditures		$ 200,000