Condensed Consolidated Statements of Stockholders' Equity - 9 months ended Oct. 07, 2018 - USD ($) $ in Thousands	Common Stock	Additional Paid-In Capital	Retained Deficit	Accumulated Other Comprehensive Loss	Total
Balance at the beginning of the period at Dec. 31, 2017	$ 74	$ 506,098	$ (78,160)	$ (24,966)	$ 403,046
Balance (in shares) at Dec. 31, 2017	74,120,113
Increase (Decrease) in Stockholders' Equity
Issuance of restricted stock awards	$ 1				1
Issuance of restricted stock awards (in shares)	1,370,576
Forfeiture of restricted stock awards (in shares)	(25,334)
Share-based compensation		10,057			10,057
Stock option exercises	$ 1	1,885			1,886
Stock option exercises (in shares)	635,388
Vested restricted stock awards withheld on net share settlement		(645)			(645)
Vested restricted stock awards withheld on net share settlement (in shares)	(112,880)
Net income			9,667		9,667
Other comprehensive income				(543)	(543)
Balance at the end of the period at Oct. 07, 2018	$ 76	$ 517,395	$ (68,493)	$ (25,509)	$ 423,469
Balance (in shares) at Oct. 07, 2018	75,987,863