Other Noncurrent Liabilities (Schedule Of Other Noncurrent Liabilities) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011
Other Noncurrent Liabilities [Abstract]
Pension and retiree medical obligations	$ 89,186	$ 91,542
Liability for uncertain tax positions	4,864	5,262
Deferred revenue	3,063	3,198
Other	15,207	15,844
Total other noncurrent liabilities	$ 112,320	$ 115,846