Stock-Based Compensation (Stock Incentive Plan) (Details) (Stock Option [Member], USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended				6 Months Ended
	Jul. 01, 2014		Jul. 02, 2013		Jul. 01, 2014		Jul. 02, 2013
Options, Outstanding [Roll Forward]
Outstanding, beginning of period	3,157,914		2,945,386		3,309,872		2,973,168
Granted	231,552	[1]	538,273	[1]	231,552	[1]	538,273	[1]
Exercised	50,989		0		193,238		0
Forfeited	13,655		9,261		23,364		37,043
Outstanding, end of period	3,324,822		3,474,398		3,324,822		3,474,398
Weighted average fair market value on option grant date	$ 10.93		$ 5.81		$ 10.93		$ 5.81
Stock based compensation expense	$ 536		$ 3,600		$ 694		$ 3,900
Capitalized stock based compensation expense	$ 29		$ 16		$ 12		$ 41
Executive Officer [Member]
Options, Outstanding [Roll Forward]
Granted			403,900
Number of officers granted awards			2
Vesting period			4 years
IPO [Member] | Executive Officer [Member]
Options, Outstanding [Roll Forward]
Vested percentage			50.00%

[1] The stock options granted in the second quarter of 2013 included 403,900 options awarded to two executive officers of which 50% vested at the time of the IPO, and the remaining vest annually in equal installements over four years on the anniversary of the grant