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Accrued Liabilities (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2012 | Dec. 31, 2011
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Schedule of accrued liabilities |  |
Salaries, wages, employment taxes and withholdings | $ 3,385 | $ 7,144
Employee benefit plans | 1,121 | 1,343
Income, property and other taxes | 472 | 1,013
Deferred revenue | 13,357 | 9,497
Restructuring accruals | 167 | 239
Other | 3,486 | 4,333
Accrued Liabilities, Current, Total | $ 21,988 | $ 23,569

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