Shareholders' Equity - Summary of Common Shares Outstanding (Details) - shares	6 Months Ended
	Jun. 28, 2015	Jun. 29, 2014
Roll forward of common shares outstanding
Balance at the beginning of the year	33,392,060	33,558,864
Repurchases	(626,882)	(211,270)
Shares issued upon exercise of stock options	5,200	101,350
Restricted share issuances	133,353	169,937
Balance at the end of the period	32,903,731	33,618,881