Annual report pursuant to Section 13 and 15(d)

Payment of Dividends (Details)

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Payment of Dividends (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 08, 2015
Dec. 09, 2014
Dec. 03, 2013
Dec. 31, 2015
Jan. 03, 2015
Dec. 28, 2013
Payments of Dividends [Abstract]            
Dividends paid (in dollars per share) $ 0.30 $ 0.30 $ 0.26 $ 0.30 $ 0.30 $ 0.26
Total outlay for dividends $ 2,618 $ 2,633 $ 2,260