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Other Liabilities (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2012 | Dec. 31, 2011
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Schedule of other liabilities |  |
Deferred revenue | $ 8,657 | $ 16,657
Noncurrent pension liability | 10,494 | 11,724
Other | 1,629 | 2,004
Other liabilities | $ 20,780 | $ 30,385

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