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Current and Noncurrent Accrued and Other Liabilities (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Dec. 31, 2008
Summary of current and noncurrent accrued and other liabilities        
Accrued payroll and benefits $ 7,267 $ 6,742    
Deferred revenue on extended warranty contracts 6,461 5,675    
Accrued warranty costs 5,370 3,996 3,138 2,820
Customer deposits 4,505 2,586    
Accrued death benefits 4,017 4,058    
Accrued group health and workers' compensation insurance claims 2,535 2,459    
Fair value of derivatives and other 2,283 2,539    
Accrued contractual manufacturing obligations 1,613 1,968    
Accrued contractual profit-sharing obligation 1,478 71    
Accrued executive benefits 1,262 1,187    
Accrued commissions 1,016 1,279    
Accrued general liability insurance claims 739 1,230    
Accrued income taxes 709 4,835    
Accrued interest 575 1,343    
Other 4,086 4,144    
Total current and noncurrent accrued liabilities 43,916 44,112    
Less noncurrent portion 15,239 12,605    
Current portion of accrued and other liabilities $ 28,677 $ 31,507