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Other Noncurrent Liabilities (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2011 | Dec. 31, 2010
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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

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