Accrued Liabilities And Deferred Credits (Accrued Liabilities And Deferred Credits) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Accrued Liabilities And Deferred Credits [Abstract]
Accrued compensation	$ 1,687	$ 7,059
Restructuring liability	790	960
Environmental and insurance liabilities	1,887	2,080
Deferred revenue	29,859	29,854
Retiree medical and other benefit reserves	100	11,282
Legal	2,972	10,021
Other accrued liabilities	10,196	11,977
Total accrued liabilities and deferred credits	$ 47,491	$ 73,233