Impairments, Restructuring Charges, and Other Items (Details) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Summary of impairment, restructuring, and other charges
Severance, restructuring costs and special termination benefits	$ 3,800,000	$ 8,000,000	$ 2,500,000
Other Asset Impairment Charges	0	400,000	400,000
Environmental reserve on sold building	600,000	100,000	1,200,000
Legal Settlements	0	0	7,300,000
Non-cash postretirement benefits curtailment and settlement gain	45,000,000	0	7,000,000
Refund of settlement notice and administrative costs	(100,000)	0	0
Moving costs	100,000	0	0
Non-cash hourly pension plan settlement loss	0	0	29,400,000
Excise tax expense on proceeds of hourly retirement plan reversion	0	0	10,900,000
Final settlement of previously terminated salary retirement plan, net of excise tax	0	0	(1,000,000)
Total impairments, restructuring charges, and other items	(40,600,000)	8,500,000	50,300,000
Segment, Continuing Operations [Member]
Summary of impairment, restructuring, and other charges
Non-cash postretirement benefits curtailment and settlement gain			$ 400,000