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Current and Noncurrent Accrued and Other Liabilities (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2010
Summary of current and noncurrent accrued and other liabilities            
Deferred revenue on extended warranty contracts $ 6,814   $ 6,461      
Accrued payroll and benefits 6,332   7,267      
Accrued warranty costs 6,078 5,616 5,370 4,598 4,284 3,996
Accrued death benefits 4,213   4,017      
Accrued group health and workers' compensation insurance claims 2,791   2,535      
Accrued contractual manufacturing obligations 2,291   1,613      
Fair value of derivatives and other 2,267   2,283      
Accrued executive benefits 1,370   1,262      
Customer deposits 1,343   4,505      
Accrued commissions 1,327   1,016      
Accrued contractual profit-sharing obligation 27   1,478      
Other 6,864   6,109      
Total current and noncurrent accrued liabilities 41,717   43,916      
Less noncurrent portion 16,310   15,239      
Current portion of accrued and other liabilities $ 25,407   $ 28,677