Share-based Compensation, Options (Details) - Options - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 28, 2017	Mar. 29, 2016
Shares
Outstanding at the beginning of the period (in shares)	118,073
Cancelled/Expired (in shares)	(2,344)
Exercised (in shares)	(38,186)
Outstanding at the end of the period (in shares)	77,543
Exercisable at the end of period (in shares)	77,543
Stock options vested (in shares)	0	0
Weighted-Average Exercise Price
Outstanding at the beginning of the period (in dollars per share)	$ 13.57
Cancelled/Expired (in dollars per share)	15.74
Exercised (in dollars per share)	14.73
Outstanding at the end of the period (in dollars per share)	12.93
Exercisable at the end of the period (in dollars per share)	$ 12.93
Weighted-Average Remaining Contractual Term
Outstanding at the end of the period	4 months 24 days
Exercisable at the end of the period	4 months 24 days
Aggregate Intrinsic Value
Outstanding at the end of the period (in dollars)	$ 2,420
Exercisable at the end of the period (in dollars)	2,420
Intrinsic value of options exercised (in dollars)	1,100	$ 3,300
Cash received before tax withholdings from options exercised	600	1,300
Excess tax benefit recognized within the income tax provision	$ 200
Excess tax benefit recorded in additional paid-in capital		$ 1,000