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Product warranties
 6 Months Ended
Jun. 29, 2013
Product Warranties Disclosures [Abstract]  
Product warranties
Product warranties

The Company warrants certain qualitative attributes of its products for up to 50 years. The Company records a provision for estimated warranty and related costs in accrued expenses, based on historical experience, and periodically adjusts these provisions to reflect actual experience.

The activity related to warranty obligations is as follows:
 
Three Months Ended
 
Six Months Ended
 
June 29,
2013
 
June 30,
2012
 
June 29,
2013
 
June 30,
2012
Balance at beginning of period
$
35,483

 
32,680

 
32,930

 
30,144

Warranty claims paid during the period
(16,306
)
 
(14,866
)
 
(29,607
)
 
(28,786
)
Acquisitions
503

 
—

 
3,283

 
—

Warranty expense during the period
13,994

 
17,053

 
27,068

 
33,509

Balance at end of period
$
33,674

 
34,867

 
33,674

 
34,867