Other Noncurrent Liabilities (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Other Noncurrent Liabilities [Abstract]
Pension liabilities	$ 105,425	$ 108,690
Postretirement benefits other than pensions	73,060	65,914
Deferred compensation	1,121	2,176
Other	6,042	4,989
Total	$ 185,648	$ 181,769