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Product warranties
 3 Months Ended
Apr. 04, 2015
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
 
April 4,
2015
 
March 29,
2014
Balance at beginning of period
$
29,350

 
35,818

Warranty claims paid during the period
(8,475
)
 
(14,024
)
Warranty expense during the period
11,540

 
11,466

Balance at end of period
$
32,415

 
33,260