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Current and Noncurrent Accrued and Other Liabilities (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2012
Dec. 31, 2011
Mar. 31, 2011
Dec. 31, 2010
Summary of current and noncurrent accrued and other liabilities        
Deferred revenue on extended warranty contracts $ 6,636 $ 6,461    
Accrued payroll and benefits 6,145 7,267    
Accrued warranty costs 5,616 5,370 4,284 3,996
Customer deposits 4,979 4,505    
Accrued death benefits 4,007 4,017    
Accrued losses on firm sales commitments 2,984      
Accrued group health and workers' compensation insurance claims 2,452 2,535    
Fair value of derivatives and other 2,013 2,283    
Accrued contractual profit-sharing obligation 1,520 1,478    
Accrued contractual manufacturing obligations 1,464 1,613    
Accrued executive benefits 1,299 1,262    
Accrued commissions 1,253 1,016    
Other 5,146 6,109    
Total current and noncurrent accrued liabilities 45,514 43,916    
Less noncurrent portion 15,492 15,239    
Current portion of accrued and other liabilities $ 30,022 $ 28,677