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Accrued Warranty Costs (Tables)
3 Months Ended
Mar. 31, 2014
Guarantees [Abstract]  
Changes in Product Warranty Obligation (Accrued Warranty Costs)

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

 

     Three Months Ended  
     March 31,  
     2014     2013  
     (In Thousands)  

Balance at beginning of period

   $ 7,297      $ 6,172   

Amounts charged to costs and expenses

     2,227        1,990   

Costs incurred

     (1,946     (1,676
  

 

 

   

 

 

 

Balance at end of period

   $ 7,578      $ 6,486