Public Offering (Details) (USD $) In Thousands, except Share data, unless otherwise specified	9 Months Ended
	Sep. 28, 2014	Sep. 29, 2013	Apr. 30, 2014
Class of Stock [Line Items]
Public stock offering	11,500,000
Share Price			$ 6.20
Proceeds from public stock offering, net of expenses	$ 67,327	$ 0
Public Offering Member
Class of Stock [Line Items]
Public stock offering	10,000,000
Underwriters' Option [Member]
Class of Stock [Line Items]
Public stock offering	1,500,000