CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2017	Jan. 01, 2017
Statement of Financial Position [Abstract]
Accounts receivable, reserves	$ 1,424	$ 2,342
Capitalized software, accumulated amortization	78,696	68,727
Other assets, accumulated amortization	$ 776	$ 776
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	170,000,000	170,000,000
Common stock, shares issued	42,898,329	48,100,143
Common stock, shares outstanding	42,898,329	48,100,143
Preferred stock, par value	$ 0.01	$ 0.01
Preferred stock, shares authorized	5,000,000	5,000,000
Preferred stock, shares issued	0	0