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Accrued Liabilities (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2012 | Dec. 31, 2011
--- | --- | ---
Payables and Accruals [Abstract] |  |
Salaries, wages and bonuses | $ 12,433 | $ 13,956
Warranty | 5,007 | 5,083
State taxes | 4,922 | 4,473
Other | 9,239 | 7,061
Accrued liabilities | $ 31,601 | $ 30,573

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