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Product warranties
 9 Months Ended
Sep. 28, 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
 
Nine Months Ended
 
September 28,
2013
 
September 29,
2012
 
September 28,
2013
 
September 29,
2012
Balance at beginning of period
$
33,674

 
34,867

 
32,930

 
30,144

Warranty claims paid during the period
(12,144
)
 
(15,166
)
 
(41,751
)
 
(43,952
)
Acquisitions
48

 
—

 
3,331

 
—

Warranty expense during the period
11,989

 
14,748

 
39,057

 
48,257

Balance at end of period
$
33,567

 
34,449

 
33,567

 
34,449