Condensed Consolidated Statements of Deficit - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 29, 2018	Sep. 30, 2017	Sep. 29, 2018	Sep. 30, 2017
Increase (decrease) in stockholders equity
Balance at beginning of the period			$ (76,231)	$ (95,101)
Balance at beginning of the period (shares)			81,535
Stock-based compensation			$ 10,031	9,186
Exercise of options			53	99
Taxes paid in connection with exercise of stock options			(57)	(2,018)
Adjustments related to the acquisition of Rambler On				(5,832)
Repurchase of Company stock			(1,967)
Dividends			(1,523)	(1,572)
Other comprehensive income (loss)			(59)	51
Net income	$ 17,030	$ 11,271	32,594	11,427
Balance at end of the period	$ (37,159)	(83,760)	$ (37,159)	(83,760)
Balance at end of the period (shares)	81,147		81,147
Common Stock
Increase (decrease) in stockholders equity
Balance at beginning of the period			$ 815	$ 814
Balance at beginning of the period (shares)			81,535	81,437
Exercise of options				$ 1
Exercise of options (shares)			11	156
Taxes paid in connection with exercise of stock options (shares)			(2)	(58)
Repurchase of Company stock			$ (4)
Repurchase of Company stock (shares)			(397)
Balance at end of the period	$ 811	$ 815	$ 811	$ 815
Balance at end of the period (shares)	81,147	81,535	81,147	81,535
Additional Paid-In Capital
Increase (decrease) in stockholders equity
Balance at beginning of the period			$ 219,095	$ 211,474
Stock-based compensation			10,031	9,186
Exercise of options			53	98
Taxes paid in connection with exercise of stock options			(57)	(2,018)
Adjustments related to the acquisition of Rambler On				(3,852)
Repurchase of Company stock			(1,963)
Balance at end of the period	$ 227,159	$ 214,888	227,159	214,888
Accumulated Deficit
Increase (decrease) in stockholders equity
Balance at beginning of the period			(296,184)	(309,575)
Adjustments related to the acquisition of Rambler On				(1,980)
Acquisition of noncontrolling interest				2,186
Dividends			(1,523)	(1,572)
Net income			32,594	11,427
Balance at end of the period	(265,113)	(299,514)	(265,113)	(299,514)
Accumulated Other Comprehensive Income (Loss)
Increase (decrease) in stockholders equity
Balance at beginning of the period			43
Other comprehensive income (loss)			(59)	51
Balance at end of the period	$ (16)	$ 51	$ (16)	51
Noncontrolling Interest
Increase (decrease) in stockholders equity
Balance at beginning of the period				2,186
Acquisition of noncontrolling interest				$ (2,186)