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Accrued Warranty Costs (Tables)
12 Months Ended
Dec. 31, 2013
Guarantees [Abstract]  
Changes in Product Warranty Obligation (Accrued Warranty Costs)

Changes in our product warranty obligation (accrued warranty costs) are as follows:

 

     2013     2012     2011  
     (In Thousands)  

Balance at beginning of year

   $ 6,172      $ 5,370      $ 3,996   

Amounts charged to costs and expenses

     7,388        6,710        6,539   

Costs incurred

     (6,263     (5,908     (5,165
  

 

 

   

 

 

   

 

 

 

Balance at end of year

   $ 7,297      $ 6,172      $ 5,370