Contingent Liabilities and Commitments (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Environmental Matters
Environmental assessment and remediation costs, undiscounted	$ 8,700,000
Accrued environmental liabilities	8,700,000	6,400,000
Estimated capital costs to comply with hazardous air pollutant regulations	100,000
Other Commitments
Commitments for construction and acquisition of property, plant, and equipment	$ 11,200,000