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Current and Noncurrent Accrued and Other Liabilities (Tables)
 12 Months Ended
Dec. 31, 2011
Current and Noncurrent Accrued and Other Liabilities [Abstract]  
Summary of current and noncurrent accrued and other liabilities
                 
    December 31,  
    2011     2010  
    (In Thousands)  
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  
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  
 
           
 
    43,916       44,112  
Less noncurrent portion
    15,239       12,605  
 
           
Current portion of accrued and other liabilities
  $ 28,677     $ 31,507