Other Income and Expense Items (Details) (USD $)	1 Months Ended	12 Months Ended
	Jan. 27, 2011	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Other Income Expense [Line Items]
Other Nonoperating Income (Expense)		$ 1,643,000	$ 312,000	$ 21,401,000
Environmental Insurance Settlement				20,300,000
Proceeds From Legal Settlements	$ 82,700,000			$ 1,900,000