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Accrued Warranty Costs (Tables)
 12 Months Ended
Dec. 31, 2011
Accrued Warranty Costs [Abstract]  
Product warranty obligation
                         
    2011     2010     2009  
    (In Thousands)  
Balance at beginning of year
  $ 3,996     $ 3,138     $ 2,820  
Amounts charged to costs and expenses
    6,539       4,479       5,252  
Costs incurred
    (5,165 )     (3,621 )     (4,934 )
 
                 
Balance at end of year
  $ 5,370     $ 3,996     $ 3,138