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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